900% is the change from 55 to 550
Calculation steps:
[( 550 - 55 ) ÷ 55] x 100 = 900%
Formula
Percentage change = [(550 - 55) / 55] x 100
Subtract the new number by the original number
550 - 55 = 495
495 ÷ 55 = 9
9 x 100 = 900%
Example