Barak spent $20 at the arcade. this represents 10% of the money he earned by working at the pizza parlor last week. how much money did barak earn at the pizza parlor last week?
$20 is 10% is what he earned, and 10 is a factor of 100 (100 for 100%). Since 10 x 10 is 100, we will also have to multiply 20 by 10: 200 Answer: $200 is what Barak earned by working in the pizza parlour.