30.91% is the change from 220 to 288
Calculation steps:
[( 288 - 220 ) ÷ 220] x 100 = 30.91%
Formula
Percentage change = [(288 - 220) / 220] x 100
Subtract the new number by the original number
288 - 220 = 68
68 ÷ 220 = 0.3090909090909091
0.3090909090909091 x 100 = 30.91%