WAEC Commerce 2011 Question 19

Use the following information: A trader's turnover was D36,000. Purchases was D28,000. The opening stock was D2,000 and the closing stock D3,000.
What is the rate of turnover?

1. A.13.5 times
2. B.10.8 times
3. C.9 times
4. D.5.4 times