It costs $.10 to print one page. Jenny wants to print 7 copies of her 25-page essay. She also wants to buy 7 pens that each cost $1.50. If she pays the store with 2 twenty dollar bills, how much money should she get in change?
Jenny needs to print 7*25= <T>multiply(7, 25)=175 pages.
This will cost 175*$.10 =$<T>multiply(175, 0.1)=17.5.
The pens will cost 7*$1.50=$<T>multiply(7, 1.5)=10.5.
In total, she will spend $17.5+$10.5=$<T>add(17.5, 10.5)=28.0
Since she pays with 2 twenty dollar bills she pays with 2*20=<T>multiply(2, 20)=40 dollars.
Thus, she will get $40-$28=$<T>subtract(40, 28)=12 in change.
