100% is the change from 83 to 166
Calculation steps:
[( 166 - 83 ) ÷ 83] x 100 = 100%
Formula
Percentage change = [(166 - 83) / 83] x 100
Subtract the new number by the original number
166 - 83 = 83
83 ÷ 83 = 1
1 x 100 = 100%
Example