Question

A display case of CDs are marked 9 for $20. If Evan wants to buy 180 CDs, how much will Evan spend (not including tax)?

Answer 1

$400

Explanation:

Use a proportion. Let x represent the amount of money Evan will spend.

9/20 = 180/x

9x =3600

x=400

So, it will cost Evan $400.