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If the average grade of an English class rose from 70 to 85, what is the approximate percent increase?


answer choices


The percent increase is 14%.

The percent increase is 17%.

The percent increase is 21%.

The percent increase is 35%.

Verified Answer :

havajahh

85 - 70 = 15

15/70 = 0.21428571428

Round to .21

Move decimal over twice to the right

21%

Answer:

The percent increase is 21%.

Step-by-step explanation:

Given,

The original average grade = 70,

New average grade = 85,

Total changes in the average grade = New average grade - original average grade

= 85 - 70

= 15

Since,

\(\text{The percentage increment in the grade}=\frac{\text{Total changes}}{\text{Original grade}}\times 100\)

\(=\frac{15}{70}\times 100\)

\(=\frac{1500}{70}\)

\(=21.4285714\approx 21\%\)

⇒ The approximate percent increase is 21 %.

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