406.06% is the change from 99 to 501
Calculation steps:
[( 501 - 99 ) ÷ 99] x 100 = 406.06%
Formula
Percentage change = [(501 - 99) / 99] x 100
Subtract the new number by the original number
501 - 99 = 402
402 ÷ 99 = 4.0606060606060606
4.0606060606060606 x 100 = 406.06%