Question

At a local print shop, 18 copies can be made for $3. At this rate, how much would it cost to make 72 copies?

Answer 1

$12

Explanation:

18 copies ------------ $3

1 copy ----------------- x it is a rule of three

then 1x$3/18 = 0.167

Then 1 copies cost $0.167

72 copies = $0.167 x 72 = $12