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,
[tex]\text{The percentage increment in the grade}=\frac{\text{Total changes}}{\text{Original grade}}\times 100[/tex]
[tex]=\frac{15}{70}\times 100[/tex]
[tex]=\frac{1500}{70}[/tex]
[tex]=21.4285714\approx 21\%[/tex]
⇒ The approximate percent increase is 21 %.
