71.43% is the change from 70 to 120
Calculation steps:
[( 120 - 70 ) ÷ 70] x 100 = 71.43%
Formula
Percentage change = [(120 - 70) / 70] x 100
Subtract the new number by the original number
120 - 70 = 50
50 ÷ 70 = 0.7142857142857143
0.7142857142857143 x 100 = 71.43%