Answer:
$64
Explanation:
Since the store buys the racket for $40 then marks it up, the store is selling it for 160% of the wholesale price. X is the price we are looking for - the price after it was marked up.
40 / x = 100/160
(40/x) * x = (100/160) * x
40 = 0.625 * x
40/0.625 = x
64 = x
x = 64