510.1% is the change from 99 to 604
Calculation steps:
[( 604 - 99 ) ÷ 99] x 100 = 510.1%
Formula
Percentage change = [(604 - 99) / 99] x 100
Subtract the new number by the original number
604 - 99 = 505
505 ÷ 99 = 5.101010101010101
5.101010101010101 x 100 = 510.1%