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 = 
<gadget id="calculator">25-15</gadget>
<output>10</output>
10.
He has 80% of them left because 100 - 20 = 
<gadget id="calculator">100-20</gadget>
<output>80</output>
80.
He has 8 left because 10 x .8 = 
<gadget id="calculator">10*.8</gadget>
<output>8</output>
8.
His parents will give her $12 for them because 8 x 1.5 = 
<gadget id="calculator">8*1.5</gadget>
<output>12</output>
12.

<result>12</result>