Corby Distilleries Supplied the Following Data at the End of the Current

Corby Distilleries supplied the following data at the end of the current year.
Finished goods inventory, Jan 1. $12,000
Finished goods inventory, Dec. 31 7,500
Cost of goods manufactured 152,380
Sales revenue 212,000
Sales commissions 19,080
Research and development costs 15,900
Required:
A. Calculate the cost of goods sold percent.
B. Calculate the gross margin percent.
C. Calculate the selling expense percent.
D. Calculate the administrative expense percent.
E. Calculate the operating income percent.