540.4% is the change from 99 to 634
Calculation steps:
[( 634 - 99 ) ÷ 99] x 100 = 540.4%
Formula
Percentage change = [(634 - 99) / 99] x 100
Subtract the new number by the original number
634 - 99 = 535
535 ÷ 99 = 5.404040404040404
5.404040404040404 x 100 = 540.4%