Answer:
$8.25
Explanation:
We first need to find the amount of money we give the cashier
20+10 = 30
We give the cashier 30 dollars
Our bill was 21.75
30.00
-21.75
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We need to borrow
2 10.00
-2 1 .75
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We need to borrow
2 9. 10 0
-2 1 .7 5
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We need to borrow
2 9. 9 10
-2 1 .7 5
---------------
8 .2 5
We will get $8.25 back from the cashier