A goatherd has the cost function c(y) = 4y^2,(c等于4乘以y的平方) ,where y is the number of tubs of goat cheese she makes per month. She faces a competitive market for goat cheese, with a price of $40 a tub. How many tubs should she produce per month?
A.
The square root of 40
B.
16
C.
The square root of 20
D.
5
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