how do you approach this one
In 1985 a company sold a brand of shoes to retailers for a fixed price per pair. In 1986 the number of pairs of the shoes that the company sold to retailers decreased by 20 percent, while the price per pair increased by 20 percent. If the companyâ€™s revenue from the sale of the shoes in 1986 was $3.0 million, what was the approximate revenue from the sale of the shoes in 1985 ?
(A) $2.4 million
(B) $2.9 million
(C) $3.0 million
(D) $3.1 million
(E) $3.6 million
let x be the no. of pairs and y be the price per pair in '85.
then in '86 the no of pairs in .8x and the price is 1.2 y,
i.e (.8x)*(1.2y) = 3 million, or (.96)xy = 3 million.
we want the revenue in '85 ie xy. so use the above to get it.