Answer:
15%
Explanation:
2.33 is 10% of 23.33 (move the decimal one place to the left)
1.17 is 5% of 2.33 (5% is half of 10%, so divide by 2)
2.33 + 1.17 = 3.50
the percentage is equal to (tip/bill) * 100
(3.50 / 23.33) * 100 = 15%
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