diff --git a/tutorial-4/worksheet/sheet04.pdf b/tutorial-4/worksheet/sheet04.pdf
index 4edacce7b7c636a3ba18bea757e32f6bd350d978..f79e60077a3f2e28f5172248dab8aaaf66712871 100644
Binary files a/tutorial-4/worksheet/sheet04.pdf and b/tutorial-4/worksheet/sheet04.pdf differ
diff --git a/tutorial-4/worksheet/sheet04.tex b/tutorial-4/worksheet/sheet04.tex
index ed91fd0ab50e625eea6a02d25b2736de68640256..5a396ecc12bcac2b03848d763051de213d8ddf5c 100644
--- a/tutorial-4/worksheet/sheet04.tex
+++ b/tutorial-4/worksheet/sheet04.tex
@@ -170,8 +170,8 @@ Consider an electricity market with two generator types, one with the cost funct
Consider the two-bus power system shown in Figure \ref{twobus}, where the two nodes represent two markets, each with different total demand $D_i$, and one generator at each node producing $P_i$. At node A the demand is $D_A = 2000 \si{\mega\watt}$, whereas at node B the demand is $D_B = 1000 \si{\mega\watt}$. Furthermore, there is a transmission line with a capacity denoted by $F_{AB}$. The marginal cost of production of the generators connected to buses A and B are given respectively by the following expressions:
\begin{align*}
- MC_A & = 20 + 0.02 P_A \hspace{1cm}\eur/\si{\mega\watt\hour} \\
- MC_B & = 15 + 0.03 P_B \hspace{1cm} \eur/\si{\mega\watt\hour}
+ MC_A & = 20 + 0.03 P_A \hspace{1cm}\eur/\si{\mega\watt\hour} \\
+ MC_B & = 15 + 0.02 P_B \hspace{1cm} \eur/\si{\mega\watt\hour}
\end{align*}
Assume that the demands $D_A$ and $D_B$ are constant and insensitive to price, that energy is sold at its marginal cost of production and that there are no limits on the output of the generators.
diff --git a/tutorial-4/worksheet/solution04.pdf b/tutorial-4/worksheet/solution04.pdf
index 44ac4b8e6d818553606a90b8dba264f94468a8ad..e45cbb53228d243ac752217312c8a8ca3f3c0840 100644
Binary files a/tutorial-4/worksheet/solution04.pdf and b/tutorial-4/worksheet/solution04.pdf differ
diff --git a/tutorial-4/worksheet/solution04.tex b/tutorial-4/worksheet/solution04.tex
index 97e45b0ffeead6211d60c717577b04335f07989f..846009faac4c32d8d0d996a0baa7bd353f3865eb 100644
--- a/tutorial-4/worksheet/solution04.tex
+++ b/tutorial-4/worksheet/solution04.tex
@@ -249,8 +249,8 @@ Consider an electricity market with two generator types, one with the cost funct
Consider the two-bus power system shown in Figure \ref{twobus}, where the two nodes represent two markets, each with different total demand $D_i$, and one generator at each node producing $G_i$. At node A the demand is $D_A = 2000 \si{\mega\watt}$, whereas at node B the demand is $D_B = 1000 \si{\mega\watt}$. Furthermore, there is a transmission line with a capacity denoted by $F_{AB}$. The marginal cost of production of the generators connected to buses A and B are given respectively by the following expressions:
\begin{align*}
- MC_A & = 20 + 0.02 P_A \hspace{1cm}\eur/\si{\mega\watt\hour} \\
- MC_B & = 15 + 0.03 P_B \hspace{1cm} \eur/\si{\mega\watt\hour}
+ MC_A & = 20 + 0.03 P_A \hspace{1cm}\eur/\si{\mega\watt\hour} \\
+ MC_B & = 15 + 0.02 P_B \hspace{1cm} \eur/\si{\mega\watt\hour}
\end{align*}
Assume that the demands $D_A$ and $D_B$ are constant and insensitive to price, that energy is sold at its marginal cost of production and that there are no limits on the output of the generators.