91.36% is the change from 220 to 421
Calculation steps:
[( 421 - 220 ) ÷ 220] x 100 = 91.36%
Formula
Percentage change = [(421 - 220) / 220] x 100
Subtract the new number by the original number
421 - 220 = 201
201 ÷ 220 = 0.9136363636363637
0.9136363636363637 x 100 = 91.36%