328.28% is the change from 99 to 424
Calculation steps:
[( 424 - 99 ) ÷ 99] x 100 = 328.28%
Formula
Percentage change = [(424 - 99) / 99] x 100
Subtract the new number by the original number
424 - 99 = 325
325 ÷ 99 = 3.282828282828283
3.282828282828283 x 100 = 328.28%