900% is the change from 100 to 1000
Calculation steps:
[( 1000 - 100 ) ÷ 100] x 100 = 900%
Formula
Percentage change = [(1000 - 100) / 100] x 100
Subtract the new number by the original number
1000 - 100 = 900
900 ÷ 100 = 9
9 x 100 = 900%
Example