A bike shop sells you a bicycle for $63 and a helmet for $21. The total cost is 150% of what the shop spent originally. How much did the shop spend originally? How much profit did the bike shop earn by selling the bicycle and helmet to you?

The bike shop made $28 dollars profit. First, you add the cost of the bike and the cost of the helmet, which is $84. Then you divide that by 150 to get what 1% would be, which is. 56. Then you multiply that by 50%, which is the part of the price that the shop profited, which is $28.