411.11% is the change from 99 to 506
Calculation steps:
[( 506 - 99 ) ÷ 99] x 100 = 411.11%
Formula
Percentage change = [(506 - 99) / 99] x 100
Subtract the new number by the original number
506 - 99 = 407
407 ÷ 99 = 4.111111111111111
4.111111111111111 x 100 = 411.11%