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Answer the following questions.(a) 39 is what percent of 12.5?(b) 42.5% of what is 20.57?

Sagot :

(a) We are at the percentage of 12.5 which equates to 39. The general formula of getting percentages is:

[tex]N\times percent=percentage\text{ result}[/tex]

For this problem, we have N = 12.5 and the percentage result is 39. We are looking on percent, wherein the derive equation to solve this is:

[tex]percent=\frac{percentage\text{ result}}{N}[/tex]

We substitute the given on the problem, getting:

[tex]\begin{gathered} \text{percent}=\frac{39}{12.5} \\ \text{percent}=3.12 \end{gathered}[/tex]

This answer is not yet in terms of %. We multiply it by 100% to write it in percent notation, hence, the answer in part (a) would be 3.12 x 100% = 312%,

(b) For this part, we are looking at N. Hence, the equation that we will use is:

[tex]N=\frac{percentage\text{ result}}{percent}[/tex]

Before calculating, we must adjust first the percent into number notation, that is, divide it by 100%. We can say that 42.5% is also equal to 0.425. Therefore, the value of N in this problem is:

[tex]N=\frac{20.57}{0.425}=48.4[/tex]

Answers:

(a) 312%

(b) 48.4

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