100% is the change from 71 to 142
Calculation steps:
[( 142 - 71 ) ÷ 71] x 100 = 100%
Formula
Percentage change = [(142 - 71) / 71] x 100
Subtract the new number by the original number
142 - 71 = 71
71 ÷ 71 = 1
1 x 100 = 100%
Example