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:
[tex]\rm Bill\:amount = \$81.79\\\\Rate\:of\:tip = 15\%[/tex]
The amount of tip will be calculated by calculating 15% of the bill amount.
[tex]\begin{aligned} \rm Amount \:of \:tip &= \$81.79 \times 15\%\\\\&= \$81.79 \times \dfrac{15}{100}\\\\&= \$12.2685 \end[/tex]
The approximate value of tip will be $12.30.
Therefore, option c is correct.
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