123.23% is the change from 99 to 221
Calculation steps:
[( 221 - 99 ) ÷ 99] x 100 = 123.23%
Formula
Percentage change = [(221 - 99) / 99] x 100
Subtract the new number by the original number
221 - 99 = 122
122 ÷ 99 = 1.2323232323232323
1.2323232323232323 x 100 = 123.23%