An electronics store is selling personal CD players. The regular price for each
CD player is $90. During a typical two weeks, the store sells 50 units. Past
sales indicate that for every $1 decrease in price, the store sells five more
units during two weeks. Calculate the price that will maximize revenue
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1 answer

revenue = price * units
x = the price decrease
r = (90  x) (50 + 5x) = 4500 + 400 x  5 x^2
the max is on the axis of symmetry ... where the 1st derivative equals zero
dr/dx = 400  10 x
400  10 x = 0 ... x = 40
price for max revenue = 90  40 👍
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