496.97% is the change from 99 to 591
Calculation steps:
[( 591 - 99 ) ÷ 99] x 100 = 496.97%
Formula
Percentage change = [(591 - 99) / 99] x 100
Subtract the new number by the original number
591 - 99 = 492
492 ÷ 99 = 4.96969696969697
4.96969696969697 x 100 = 496.97%