Assuming the perpetual inventory system is used for the financial information presented below:

Operating expenses $45,000

Sales returns and allowances $13,000

Sales discount $6,000

Sales revenue $150,000

Costs of sales $77,000

The amount of gross profit on the income statement would be:

a. $54,000.

b. $73,000.

c. $60,000.

d. $76,000.