Calculate the discount received in Department B
\(\begin{array}{c|c} & \text{Dept A} & \text{Dept B} \\ \hline & N & \\ \hline \text{Sales} & 250 000 & 500 000 \\ \hline \text{Purchases} & 150 000 & 250 000 \\ \hline \text{Discount received} & 24 000 & \\ \hline \text{Discount allowed} & 15 000 & &
\end{array}\)