410.1% is the change from 99 to 505
Calculation steps:
[( 505 - 99 ) ÷ 99] x 100 = 410.1%
Formula
Percentage change = [(505 - 99) / 99] x 100
Subtract the new number by the original number
505 - 99 = 406
406 ÷ 99 = 4.101010101010101
4.101010101010101 x 100 = 410.1%