Missing key financial data prevents calculating sales Steps:

• Opening inventory = $5000; closing inventory = 90$5000 = $4500.
• Cost of sales requires purchases, which are not provided.
• Markup of 50% relates sales to cost of sales, but cost of sales cannot be determined without purchases.
• Operating expenses are irrelevant to sales calculation.

Why C is correct:

• Not enough information to compute sales, so no option is valid; C is listed but unsupported.

Why the others are wrong:

• A: Assumes unsubstantiated high purchases inflating sales.
• B: Similarly overestimates based on missing data.
• D: Underestimates without basis in given figures.

Final answer: Not enough information.