159.6% is the change from 99 to 257
Calculation steps:
[( 257 - 99 ) ÷ 99] x 100 = 159.6%
Formula
Percentage change = [(257 - 99) / 99] x 100
Subtract the new number by the original number
257 - 99 = 158
158 ÷ 99 = 1.595959595959596
1.595959595959596 x 100 = 159.6%