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Problem-Solving and Data Analysis / Percentages Difficulty: Easy

$21$ is $21 percent sign$ of what number?

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Explanation

Choice D is correct. Let $x$ represent the number that $21$ is $21 percent sign$ of. It follows that $\frac{21}{x} = \frac{21}{100}$ . Multiplying each side of this equation by $x$ yields $21 = \frac{21 x}{100}$ . Multiplying each side of this equation by $100$ yields $2,100 equals 21 x$ . Dividing each side of this equation by $21$ yields $100 equals x$ . Therefore, $21$ is $21 percent sign$ of $100$ .

Choice A is incorrect. $21 percent sign$ of $0$ is $0$ , not $21$ .

Choice B is incorrect. $21 percent sign$ of $1$ is $0.21$ , not $21$ .

Choice C is incorrect. $21 percent sign$ of $42$ is $8.82$ , not $21$ .