Question

What percentage of the original bill was the tip ? Round your answer to the nearest whole percent

Answer 1

We can solve this question by applying the rule of three:

`\begin{gathered} \text{ \$37.92 ------- 100\%} \\ \text{ \$7.08 ------- x } \end{gathered}`

By cross multiplying these values, we have

`\text{ \$37.92 }* x=\text{ \$7.08 }*\text{ 100\%}`

since we need to isolate x, by dividing both sides by $37.92, we get

`x=\frac{\text{ \$7.08}*\text{ 100\%}}{\text{ \$37.92}}`

So, x is given by

`x=18.67\text{ \%}`

Therefore, by rounding to the nearest whole percent, the answer is 19 %