900% is the change from 50 to 500
Calculation steps:
[( 500 - 50 ) ÷ 50] x 100 = 900%
Formula
Percentage change = [(500 - 50) / 50] x 100
Subtract the new number by the original number
500 - 50 = 450
450 ÷ 50 = 9
9 x 100 = 900%
Example