100% is the change from 84 to 168
Calculation steps:
[( 168 - 84 ) ÷ 84] x 100 = 100%
Formula
Percentage change = [(168 - 84) / 84] x 100
Subtract the new number by the original number
168 - 84 = 84
84 ÷ 84 = 1
1 x 100 = 100%
Example