diff --git a/2nd/14_Information_Chiffrée_2/exercises.tex b/2nd/14_Information_Chiffrée_2/exercises.tex
index debefe7..1c0b159 100644
--- a/2nd/14_Information_Chiffrée_2/exercises.tex
+++ b/2nd/14_Information_Chiffrée_2/exercises.tex
@@ -84,13 +84,14 @@
             \begin{tikzpicture}[
                 baseline,
                 roundnode/.style={circle, draw=highlightbg, fill=green!5, very thick, minimum size=3mm},
+                arrow/.style={->, shorten >=5pt, shorten <=5pt}
                 ]
                 %Nodes
                 \node[roundnode]        (leftterme)       {\makebox[0.5cm]{120}};
                 \node[roundnode]        (centerterm)      [right=2cm of leftterme] {\makebox[0.5cm]{...}};
 
                 %Lines
-                \path[->] (leftterme.north) edge [bend left]
+                \path[arrow] (leftterme.north) edge [bend left]
                 node [pos=0.5, above] {+25\%}
                 node [pos=0.5, below] {\times CM = ...}
                 (centerterm.north)
@@ -101,13 +102,14 @@
             \begin{tikzpicture}[
                 baseline,
                 roundnode/.style={circle, draw=highlightbg, fill=green!5, very thick, minimum size=3mm},
+                arrow/.style={->, shorten >=5pt, shorten <=5pt}
                 ]
                 %Nodes
                 \node[roundnode]        (leftterme)       {\makebox[0.5cm]{55}};
                 \node[roundnode]        (centerterm)      [right=2cm of leftterme] {\makebox[0.5cm]{...}};
 
                 %Lines
-                \path[->] (leftterme.north) edge [bend left]
+                \path[arrow] (leftterme.north) edge [bend left]
                 node [pos=0.5, above] {+...}
                 node [pos=0.5, below] {\times 0.12}
                 (centerterm.north)
@@ -118,13 +120,14 @@
             \begin{tikzpicture}[
                 baseline,
                 roundnode/.style={circle, draw=highlightbg, fill=green!5, very thick, minimum size=3mm},
+                arrow/.style={->, shorten >=5pt, shorten <=5pt}
                 ]
                 %Nodes
                 \node[roundnode]        (leftterme)       {\makebox[0.5cm]{34}};
                 \node[roundnode]        (centerterm)      [right=2cm of leftterme] {\makebox[0.5cm]{123}};
 
                 %Lines
-                \path[->] (leftterme.north) edge [bend left]
+                \path[arrow] (leftterme.north) edge [bend left]
                 node [pos=0.5, above] {+...\%}
                 node [pos=0.5, below] {\times ...}
                 (centerterm.north)
@@ -207,22 +210,23 @@
         \begin{center}
             \begin{tikzpicture}[
                 roundnode/.style={circle, draw=highlightbg, fill=green!5, very thick, minimum size=3mm},
-                node distance=2cm and 2cm
+                node distance=2cm and 2cm,
+                arrow/.style={->, shorten >=5pt, shorten <=5pt}
                 ]
                 %Nodes
                 \node[roundnode]        (termA)        {\makebox[0.5cm]{}};
                 \node[roundnode]        (termB)      [right=of termA] {\makebox[0.5cm]{}};
                 \node[roundnode]        (termC)      [right=of termB] {\makebox[0.5cm]{}};
                 \node[roundnode]        (termD)      [right=of termC] {\makebox[0.5cm]{}};
-                \node                   (termE)      [right=of termD] {\makebox[0.5cm]{...}};
-                \node[roundnode]        (termF)      [right=of termE] {\makebox[0.5cm]{}};
+                \node                   (termE)      [right=1cm of termD] {\makebox[0.5cm]{...}};
+                \node[roundnode]        (termF)      [right=1cm of termE] {\makebox[0.5cm]{}};
 
                 %Lines
-                \path[->] (termA.north) edge [bend left=50] node [above]  {$+t_1$} node [below] {$\times CM_1$} (termB.north) ;
-                \path[->] (termB.north) edge [bend left=50] node [above]  {$+t_2$} node [below] {$\times CM_2$} (termC.north) ;
-                \path[->] (termC.north) edge [bend left=50] node [above]  {$+t_3$} node [below] {$\times CM_3$} (termD.north) ;
+                \path[arrow] (termA.north) edge [bend left=50] node [above]  {$+t_1$} node [below] {$\times CM_1$} (termB.north) ;
+                \path[arrow] (termB.north) edge [bend left=50] node [above]  {$+t_2$} node [below] {$\times CM_2$} (termC.north) ;
+                \path[arrow] (termC.north) edge [bend left=50] node [above]  {$+t_3$} node [below] {$\times CM_3$} (termD.north) ;
 
-                \path[->] (termA.south) edge [bend right=10] node [above]  {Taux d'évolution global} node [below] {$\times CM_1 \times CM_2 \times CM_3 \times ...$} (termF.south);
+                \path[arrow] (termA.south) edge [bend right=10] node [above]  {Taux d'évolution global} node [below] {$\times CM_1 \times CM_2 \times CM_3 \times ...$} (termF.south);
             \end{tikzpicture}    
         \end{center}
     \end{propriete}
@@ -233,24 +237,24 @@
             \begin{center}
                 \begin{tikzpicture}[
                     roundnode/.style={circle, draw=highlightbg, fill=green!5, very thick, minimum size=3mm},
-                    node distance=2cm and 2cm
+                    arrow/.style={->, shorten >=5pt, shorten <=5pt}
                     ]
                     %Nodes
                     \node[roundnode]        (termA)        {\makebox[0.5cm]{}};
-                    \node[roundnode]        (termB)      [right=of termA] {\makebox[0.5cm]{}};
-                    \node[roundnode]        (termC)      [right=of termB] {\makebox[0.5cm]{}};
-                    \node[roundnode]        (termD)      [right=of termC] {\makebox[0.5cm]{}};
-                    \node[roundnode]        (termE)      [right=of termD] {\makebox[0.5cm]{}};
-                    \node[roundnode]        (termF)      [right=of termE] {\makebox[0.5cm]{}};
+                    \node[roundnode]        (termB)      [right=2cm of termA] {\makebox[0.5cm]{}};
+                    \node[roundnode]        (termC)      [right=2cm of termB] {\makebox[0.5cm]{}};
+                    \node[roundnode]        (termD)      [right=2cm of termC] {\makebox[0.5cm]{}};
+                    \node[roundnode]        (termE)      [right=2cm of termD] {\makebox[0.5cm]{}};
+                    \node[roundnode]        (termF)      [right=2cm of termE] {\makebox[0.5cm]{}};
 
                     %Lines
-                    \path[->] (termA.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termB.north) ;
-                    \path[->] (termB.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termC.north) ;
-                    \path[->] (termC.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termD.north) ;
-                    \path[->] (termD.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termE.north) ;
-                    \path[->] (termE.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termF.north) ;
+                    \path[arrow] (termA.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termB.north) ;
+                    \path[arrow] (termB.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termC.north) ;
+                    \path[arrow] (termC.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termD.north) ;
+                    \path[arrow] (termD.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termE.north) ;
+                    \path[arrow] (termE.north) edge [bend left=50] node [above]  {$+10\%$} node [below] {$\times ...$} (termF.north) ;
 
-                    \path[->] (termA.south) edge [bend right=10] node [above]  {Taux d'évolution global} node [below] {$\times ... \times ... \times ... \times ... \times ... = \times ...$} (termF.south);
+                    \path[arrow] (termA.south) edge [bend right=10] node [above]  {Taux d'évolution global} node [below] {$\times ... \times ... \times ... \times ... \times ... = \times ...$} (termF.south);
                 \end{tikzpicture} 
             \end{center}
             Le coefficient global est donc de $CM = ...$
@@ -282,3 +286,46 @@
 \begin{solution}
     <++>
 \end{solution}
+
+\begin{exercise}[subtitle={Évolutions réciproques}, step={4}, origin={Création}, topics={ Information Chiffrée 2 }, tags={ Information chiffrée }, mode={\faIcon{users}}]
+    <++>
+\end{exercise}
+
+\begin{solution}
+
+    \section*{Taux d'évolution réciproque}
+    \begin{propriete}
+        Quand une quantité subit une évolution et que l'on souhaite revenir à la valeur initiale, elle subit une \textbf{évolution réciproque}.        
+
+        \begin{center}
+            \begin{tikzpicture}[
+                roundnode/.style={circle, draw=highlightbg, fill=green!5, very thick, minimum size=3mm},
+                node distance=5cm and 5cm,
+                arrow/.style={->, shorten >=5pt, shorten <=5pt}
+                ]
+                %Nodes
+                \node[roundnode]        (termA)        {\makebox[0.5cm]{$v_i$}};
+                \node[roundnode]        (termB)      [right=of termA] {\makebox[0.5cm]{$v_f$}};
+
+                %Lines
+                \path[arrow] (termA.north) edge [bend left] node [above]  {$+t_1$} node [below] {$\times CM$} (termB.north) ;
+
+                \path[arrow] (termB.south) edge [bend left] node [above] {$\times \dfrac{1}{CM}$} node [below] {Taux d'évolution réciproque} (termA.south);
+            \end{tikzpicture}    
+        \end{center}
+
+        Le coefficient multiplicateur de l'évolution réciproque est égal à $\dfrac{1}{CM}$.
+
+        Le taux d'évolution réciproque est égal à $\dfrac{1}{CM} - 1$
+    \end{propriete}
+
+    \paragraph{Exemples:}
+    \begin{itemize}
+        \item Un article coûte 50\euro hors taxe. Une diminution de 20\% fait passer le prix à 40\euro. Quelle devra être l'augmentation pour revenir au prix initial?
+            \vspace{1cm}
+        \item Une entreprise a augmenté ses emissions de CO2 de 14\% en un an. Quelle devra être l'évolution pour revenir aux émissions d'avant cette augmentation?
+            \vspace{1cm}
+    \end{itemize}
+    \afaire{Traiter les exemples}
+
+\end{solution}
diff --git a/2nd/14_Information_Chiffrée_2/plan_de_travail.pdf b/2nd/14_Information_Chiffrée_2/plan_de_travail.pdf
index ac70667..e47c0d6 100644
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diff --git a/2nd/14_Information_Chiffrée_2/solutions.pdf b/2nd/14_Information_Chiffrée_2/solutions.pdf
index 2675bfd..2f3c1e6 100644
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