100% is the change from 68 to 136
Calculation steps:
[( 136 - 68 ) ÷ 68] x 100 = 100%
Formula
Percentage change = [(136 - 68) / 68] x 100
Subtract the new number by the original number
136 - 68 = 68
68 ÷ 68 = 1
1 x 100 = 100%
Example