Answer:
1 dollar
Step-by-step explanation:
This is simple you multiply 20 by how much money
20 x .45 = 9 then we will take how much money you SPENT and minus it from what you gave the cashier
10 - 9 = 1 you got 1 dollar in change
-0.5
just divide the numbers first then add them together
40 Girls.
80 multipled by 0.5 = 40