258.59% is the change from 99 to 355
Calculation steps:
[( 355 - 99 ) ÷ 99] x 100 = 258.59%
Formula
Percentage change = [(355 - 99) / 99] x 100
Subtract the new number by the original number
355 - 99 = 256
256 ÷ 99 = 2.585858585858586
2.585858585858586 x 100 = 258.59%