Question

A computer company can sell 130 boxes of printer paper each week at a price of $9 per box. For each $1 increase in the price, it will sell 10 fewer boxes per week. What price per box will provide the maximum revenue for the computer company?
$9

$10

$11

$12

Answer 1

$11 because you take ten off for every extra dollar above nine. If you do 9*130 you get $1170. If you do $10 you subtract ten from the 130 boxes of printer paper each week so that would be 130-10=120 then you multiply 120*10=$1200.  If you do $11 you subtract twenty from the 130 boxes because that's two extra dollars, 130-20=110. 110*11= $1210. If you do twenty you have to subtract 30 boxes, 130-30=100. 100*12= 1200. Therefore, $11 per box would be the highest revenue for the company.