101.01% is the change from 99 to 199
Calculation steps:
[( 199 - 99 ) ÷ 99] x 100 = 101.01%
Formula
Percentage change = [(199 - 99) / 99] x 100
Subtract the new number by the original number
199 - 99 = 100
100 ÷ 99 = 1.0101010101010102
1.0101010101010102 x 100 = 101.01%