Question

What percent of 108 is 81? Use the percent circle.

Answer 1

Let the unknown number be x

x% of 108 = 81

$\begin{gathered} \frac{x}{100}\text{ }\times108\text{ = 81} \\ \frac{108x}{100}\text{ = 81} \\ 1.08x\text{ = 81} \\ x\text{ =}\frac{81}{1.08}\text{ =75} \end{gathered}$

Thus 75% of 108 is 81