A Stationary Store Sells Rolls of Standard Gift Wrap and Deluxe

Essay

A stationary store sells rolls of standard gift wrap and deluxe gift wrap. They can stock a total of 110 rolls of gift wrap, of which at least 40 must be standard wrap and at least 20 must be deluxe wrap. The profit on a roll of standard wrap is $4 and the profit on a roll of deluxe wrap is $5. How many rolls of each type of gift wrap should the store stock to maximize their profit?