Question

Using mental math, the approximate tip to leave for a bill of $81. 79, if you tip 15% would be _____. A. $8. 20 b. $10. 30 c. $12. 30 d. $16. 40.

Answer 1

The approximate tip for a bill of $81.79 would be $12.30 when the tip is 15% of the bill amount.

How to calculate tip amount?

Tip is the extra amount paid over a bill for the services provided by the staff. The tip when calculated as a percentage over the bill, the percentage rate is to be multiplied by the bill amount.

Given:

$\rm Bill\:amount = \ 81.79\\\\Rate\:of\:tip = 15\%$

The amount of tip will be calculated by calculating 15% of the bill amount.

$\begin{aligned} \rm Amount \:of \:tip &= \ 81.79 \times 15\%\\\\&= \ 81.79 \times \dfrac{15}{100}\\\\&= \ 12.2685 \end$

The approximate value of tip will be $12.30.

Therefore, option c is correct.

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