Mackinaw Inc. processes a base chemical into plastic. Standard costs and actual costs for direct materials, direct labor, and factory overhead incurred for the manufacture of 40,000 units of product were as follows: Standard Costs Actual Costs Direct materials 120,000 lbs. at $3.20 per lb. 118,500 lbs. at $3.25 per lb. Direct labor 12,000 hrs. at $24.40 per hr. 11,700 hrs. at $25.00 per hr. Factory overhead Rates per direct labor hr., based on 100% of normal capacity of 15,000