Question

Cierra and her sister enjoyed a dinner in a restaurant and the bill was $\$81.50$. If she wants to leave $18\%$of the total bill as her tip, how much should she leave?

Short answer

If Cierra wants to leave $18\%$of the total bill as her tip, she should leave $\$14.67$.

Step-by-step solution

Step 1. Given that, 

The total bill is, $\$81.50$.

The percent she needs to leave as a tip is,$18\%$.

It is mentioned that, Cierra needs to leave $18\%$of $81.50$.

Let $t=$Amount of bill.

Let us create an equation by using the given information.

$t=\left(18\%\right)\times 81.50$

Step 2. Now simplify the obtained equation.

$$\begin{gathered} t=\frac{18}{100}\times 81.50 \\ t=0.18\times 81.50 \\ t=14.67 \end{gathered}$$

Step 3. Let us check the answer.

$$\begin{gathered} (20\%)\times 80=\frac{20}{100}\times 80 \\ =0.2\times 80 \\ =16 \end{gathered}$$

Yes, $20\%$of $80$is $16$.

If Cierra wants to leave $18\%$of the total bill as her tip, she should leave$\$14.67$.