900% is the change from 10 to 100
Calculation steps:
[( 100 - 10 ) ÷ 10] x 100 = 900%
Formula
Percentage change = [(100 - 10) / 10] x 100
Subtract the new number by the original number
100 - 10 = 90
90 ÷ 10 = 9
9 x 100 = 900%
Example