550.51% is the change from 99 to 644
Calculation steps:
[( 644 - 99 ) ÷ 99] x 100 = 550.51%
Formula
Percentage change = [(644 - 99) / 99] x 100
Subtract the new number by the original number
644 - 99 = 545
545 ÷ 99 = 5.505050505050505
5.505050505050505 x 100 = 550.51%