A warehouse is being designed. The brick walls will cost $3 per square foot to build. The roof is to be flat and square and will cost $24 per square foot to build. The volume of the building is to be 32,000 cubic feet. 
Which of the following expresses the cost of building the warehouse?
A. 4xh + x2
B. x2h = 32,000
C. 4xh + 24x2 = 32,000
D. 12xh + 24x2
E. none of these
Answer: D
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