The estimated monthly sales of Mona Lisa paint-by-number sets is given by the formula
?

?
where q is the demand in monthly sales and p is the retail price in yen. At what price will revenue be a maximum? Round the answer to the nearest hundredth.
?

A. 66.99 yen
B. 0.56 yen
C. 0.78 yen
D. 0.99 yen
E. 1.22 yen


Answer: B

Mathematics

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