Assume that the following costs were incurred for the month: direct materials of $39,000; direct labor of $23,000; manufacturing overhead of $17,000; selling expenses of $14,000; and administrative expenses of $27,000. a. Concept Definition: Provide a definition for prime/primary cost and explain why this concept is used in decision making situations? Enter your final answer in the space below. b. Concept Application: What is the total dollar amount of prime costs for the month? You are required to show each dollar amount used in your supporting calculations and each dollar amount must be labeled with the proper title. Enter your final answer in the space below.