George is about to celebrate his 25th birthday. Since his 15th birthday, he's been given a special $1 bill from his parents. They told him that on his 25th birthday, for every bill he still has, they will give him $1.5 in exchange. He spent 20% of his special bills. How much will he receive from his parents when he exchanges them?
He received 10 special bills because 25 - 15 = <T>subtract(25, 15)=10
He has 80% of them left because 100 - 20 = <T>subtract(100, 20)=80
He has 8 left because 10 x .8 = <T>multiply(10, 0.8)=8.0
His parents will give her $12 for them because 8 x 1.5 = <T>multiply(8, 1.5)=12.0
