Answer:
21.16
Explanation:
First find the tax
16.40 * 9%
16.40 *.09 = 1.476 = 1.48
Then we need to find the tip
16.40 *20%
16.40 *.20 = 3.28
The total is the bill plus tax plus tip
16.40 + 1.48 + 3.28
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