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【单选题】
Suppose that Dent Carr's long run total cost of repairing s cars per week is c(s)=3s 2 + 27.If the price he receives for repairing a car is 30, then in the long run, how many cars will he fix perweek if he maximizes profits?A.
5
B.
0
C.
10
D.
7.5
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