9.09% is the change from 220 to 240
Calculation steps:
[( 240 - 220 ) ÷ 220] x 100 = 9.09%
Formula
Percentage change = [(240 - 220) / 220] x 100
Subtract the new number by the original number
240 - 220 = 20
20 ÷ 220 = 0.09090909090909091
0.09090909090909091 x 100 = 9.09%