Answer:
$12
Explanation:
given:
Stefan sells jin a bicycle for $114 and a helmet for $18.
we're gonna add to get the total cost 114 + 18 = $132
The total cost is 110% of what he spent originally to buy the bike and helmet.
divide 110% by 100 to get the answer in decimal which if you calculate is 1.1
now we're gonna make a simple equation and assume what Stefan spends originally is x
1.1 * x = 132
1.1x = 132
(now we want x to be alone so we can find its value so divide both sides by 1.1 (division is the opposite of multiplication if, for example, we have 1.1 - x 1.1 is positive so take it to the other side it'll be negative))
after dividing x=120
therefore, he originally spent $120
and to find how much money Stefan made we're gonna subtract 132-120 = $12
Stefan made $12