Question: An auditor noted that client sales increased 10 percent for the year. At the same time, Cost of Goods Sold as a percentage of sales had decreased from 45 percent to 40 percent and year-end accounts receivable had increased by 8 percent.

Based on this information, the auditor interviewed the sales manager, who stated that the increase in sales without a corresponding increase in cost of goods sold was due to a price increase enacted by the company during the year. How would the auditor test the sales manager's representation?

a. Perform additional inquiries with sales personnel.

b. Obtain copies of all price lists in use during the year and vouch the prices to sales invoices.

c. Send confirmations asking customers about unit prices paid for product.

d. Vouch vender invoices to payments made after year-end.