Chapter 7, Problem 19MCQ

To determine

To find: The percent of the number.

Answer to Problem 19MCQ

The $10\%\text{ of 40 is 4}\text{.}$

Explanation of Solution

Given information: What percent of $40$ is $4$ .

Calculation: Percent $(\%)$ means ‘out of $100$ ’ and when dealing with percents the word ‘of’ means ‘times or to multiply’.

Let, The percent we are looking for is $x\text{ \%}$ .

Hence, $x\%$ can be written as $\frac{x}{100}$ and $x\%\text{ of 40}$ can be written as $\frac{x}{100}\times 40$ .

Let’s find the value of $x$ ,

  $\begin{array}{c}\frac{x}{100}\times 40=4\\ x=\frac{4\times 100}{40}\\ x=\frac{100}{10}\\ x=10\end{array}$

Hence, The $10\%\text{ of 40 is 4}\text{.}$