421.21% is the change from 99 to 516
Calculation steps:
[( 516 - 99 ) ÷ 99] x 100 = 421.21%
Formula
Percentage change = [(516 - 99) / 99] x 100
Subtract the new number by the original number
516 - 99 = 417
417 ÷ 99 = 4.212121212121212
4.212121212121212 x 100 = 421.21%