100% is the change from 86 to 172
Calculation steps:
[( 172 - 86 ) ÷ 86] x 100 = 100%
Formula
Percentage change = [(172 - 86) / 86] x 100
Subtract the new number by the original number
172 - 86 = 86
86 ÷ 86 = 1
1 x 100 = 100%
Example