Use the following to answer the given question
\(\begin{array}{c|c} & N \\ \hline sales & 45,000 \\ \text{Opening stock} & 20,000 \\ \text{Closing sock} & 30,000 \\ Expenses & 15,000 \\ \text{Fixed assets} & 40,000 \\ Debtors & 10,000 \\ Creditors & 5,000 \\ Purchases & 25,000 \end{array}\)
Gross profit percentage is