99% is the change from 100 to 199
Calculation steps:
[( 199 - 100 ) ÷ 100] x 100 = 99%
Formula
Percentage change = [(199 - 100) / 100] x 100
Subtract the new number by the original number
199 - 100 = 99
99 ÷ 100 = 0.99
0.99 x 100 = 99%
Example