1100% is the change from 20 to 240
Calculation steps:
[( 240 - 20 ) ÷ 20] x 100 = 1100%
Formula
Percentage change = [(240 - 20) / 20] x 100
Subtract the new number by the original number
240 - 20 = 220
220 ÷ 20 = 11
11 x 100 = 1100%
Example