900% is the change from 2 to 20
Calculation steps:
[( 20 - 2 ) ÷ 2] x 100 = 900%
Formula
Percentage change = [(20 - 2) / 2] x 100
Subtract the new number by the original number
20 - 2 = 18
18 ÷ 2 = 9
9 x 100 = 900%
Example