You do cross mulitply. so 100*7.5=750 and then 750 divided by 60=12.5
So x=12.5
The answer would be 12oz since there is 4 bottles of 3oz perfume and all together that would add too 12oz.
He makes $232 because 8 x 4 =32 and 32 x 7.25 = 232
$29.22 because $100-$70.78=$29.22
Hope I helped let me know.
