407.07% is the change from 99 to 502
Calculation steps:
[( 502 - 99 ) ÷ 99] x 100 = 407.07%
Formula
Percentage change = [(502 - 99) / 99] x 100
Subtract the new number by the original number
502 - 99 = 403
403 ÷ 99 = 4.070707070707071
4.070707070707071 x 100 = 407.07%