Question

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

Answer 1

85 - 70 = 15

15/70 = 0.21428571428

Round to .21

Move decimal over twice to the right

21%

Answer 2

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 %.