Use the following information to answer the question below
Cost of raw materials available------ 32,000
Manufacturing wages -----10,000
Factory expenses-----5,000
Royalty-------3,000
Factory rent ------2,000
Depreciation of plant and machinery---- 5,000
closing stock of raw materials-------- 3,000
The prime cost is

A. $ 57,000
B. $45,000
C. $42,000  
D. $39,000

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Correct Answer: C