## Thinking Mathematically (6th Edition)

Published by Pearson

# Chapter 8 - Personal Finance - 8.1 Percent, Sales Tax and Discounts - Exercise Set 8.1: 65

#### Answer

A 100-dollar bill is enough to cover the total cost.

#### Work Step by Step

The bill comes to $\$80$. We can find the amount of a 20% tip. Note that 20% = 0.20$tip = (0.20)(\$80) = \$16$The total amount is$\$80+\$16$, which is$\$96$. A 100-dollar bill is enough to cover the total cost.

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