Costs have been compiled for a certain manufacturing company for the most recent year. The summary is shown in the table below. The company operates two different manufacturing plants, plus a corporate headquarters. Determine
(a) The factory overhead rate for each plant, and
(b) The corporate overhead rate. The firm will use these rates in the following year.

Expense category Plant 1 Plant 2 Corporate headquarters Direct labor Materials Factory expense Corporate expense $1,000,000 S1,750,000 S3,500,000 $4,000,000 S1 ,300,000 S2,300,000 S5,000,000