257.58% is the change from 99 to 354
Calculation steps:
[( 354 - 99 ) ÷ 99] x 100 = 257.58%
Formula
Percentage change = [(354 - 99) / 99] x 100
Subtract the new number by the original number
354 - 99 = 255
255 ÷ 99 = 2.5757575757575757
2.5757575757575757 x 100 = 257.58%