309.09% is the change from 220 to 900
Calculation steps:
[( 900 - 220 ) ÷ 220] x 100 = 309.09%
Formula
Percentage change = [(900 - 220) / 220] x 100
Subtract the new number by the original number
900 - 220 = 680
680 ÷ 220 = 3.090909090909091
3.090909090909091 x 100 = 309.09%