William bought a photocopier and supplies

Question

William bought a photocopier and supplies for $162.50, which will allow him to make copies for $0.12 each. A photocopy store charges $0.21 for each copy. How many copies must William make before his total cost is less than getting copies made at a photocopy store?

Answer 1

162.5 + .12C = .21C

.21C -.12C = 162.5

.09C = 162.5

C= 162.5/.09 = about 1805.6 copies

He needs to make at least 1,806 copies for the cost to be less than going to the photocopy store