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?

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.

$220100%
$25.3  x
x=($25.3 * 100%) / $220=11.5%

The discount was.  11.5%. 

9/12 is the answer because 3/4 times 3 each is 9/12

Ac equals 35 cm long