515.15% is the change from 99 to 609
Calculation steps:
[( 609 - 99 ) ÷ 99] x 100 = 515.15%
Formula
Percentage change = [(609 - 99) / 99] x 100
Subtract the new number by the original number
609 - 99 = 510
510 ÷ 99 = 5.151515151515151
5.151515151515151 x 100 = 515.15%