100% is the change from 121 to 242
Calculation steps:
[( 242 - 121 ) ÷ 121] x 100 = 100%
Formula
Percentage change = [(242 - 121) / 121] x 100
Subtract the new number by the original number
242 - 121 = 121
121 ÷ 121 = 1
1 x 100 = 100%
Example