20% is the change from 70 to 84
Calculation steps:
[( 84 - 70 ) ÷ 70] x 100 = 20%
Formula
Percentage change = [(84 - 70) / 70] x 100
Subtract the new number by the original number
84 - 70 = 14
14 ÷ 70 = 0.2
0.2 x 100 = 20%
Example