Question

Andy bought a game system on sale for $194.70. It was originally priced at $220. What is the percent of the discount on this game system?

Answer 1

1) we calculate the discount 

discount=$220 -$194.7=$25.3

2) now, we calculate the percent of the discount on this game system by the rule of three.

$220--------------------------100%
$25.3---------------------------  x
x=($25.3 * 100%) / $220=11.5%

The discount was.  11.5%.