cdy company manufactures an electronic mechanism. Last year, the per-unit product costs was $60, the per-unit prime costs was $38, and the per-unit conversion cost was $45. Cost of goods sold for the year was $600,000 and the sale price per unit was $110. In addition, direct labor costs of $210,000 and selling and administrative expenses of $250,000 were incurred.

A. Calculate how many units were sold last year

B. Compute the costs of direct materials used

C. Compute the cost of overhead

D. Compute the gross margin for the year

E. Calculate operating income.