45.91% is the change from 220 to 321
Calculation steps:
[( 321 - 220 ) ÷ 220] x 100 = 45.91%
Formula
Percentage change = [(321 - 220) / 220] x 100
Subtract the new number by the original number
321 - 220 = 101
101 ÷ 220 = 0.4590909090909091
0.4590909090909091 x 100 = 45.91%