259.6% is the change from 99 to 356
Calculation steps:
[( 356 - 99 ) ÷ 99] x 100 = 259.6%
Formula
Percentage change = [(356 - 99) / 99] x 100
Subtract the new number by the original number
356 - 99 = 257
257 ÷ 99 = 2.595959595959596
2.595959595959596 x 100 = 259.6%