As Part of Audit Planning,you Have Calculated Gross Margin for the Last

Multiple Choice

As part of audit planning,you have calculated gross margin for the last five years and compared gross margin to industry averages.Your client's gross margin has increased by about 5% in the current year,while the industry gross average has declined.One possible cause of this increased gross margin is

A) higher cost of goods sold.
B) increased bad debt expenses.
C) fictitious revenue.
D) fictitious expenses.