Answer:
Step-by-step explanation:
Gabe went out for lunch with his best friend the bill costs $16.40
This amount was before tax and the tip that he wanted to give.
He paid a 9 percent tax on the bill. The amount of the 9 percent tax is 9/100 × 16.40 = 0.09 × 16.40 = $1.476
He left a 20 percent tip. This means that amount left as tip is 20/100 × 16.40 = 0.2×16.40 = $3.28
The amount that Gabe paid would be the sum of the bill, the tip and the amount paid on tax. It becomes
16.40 + 1.476 + 3.28 = $21.156
