Scenario 13-5 A Certain Firm Produces and Sells Staplers. Last Year, It

Scenario 13-5
A certain firm produces and sells staplers. Last year, it produced 7,000 staplers and sold each stapler for $6. In producing the 7,000 staplers, it incurred variable costs of $28,000 and a total cost of $45,000.
-Refer to Scenario 13-5.The firm's fixed costs amounted to

A) $7,000.
B) $17,000.
C) $28,000.
D) $42,000.