90.05% is the change from 221 to 420
Calculation steps:
[( 420 - 221 ) ÷ 221] x 100 = 90.05%
Formula
Percentage change = [(420 - 221) / 221] x 100
Subtract the new number by the original number
420 - 221 = 199
199 ÷ 221 = 0.9004524886877828
0.9004524886877828 x 100 = 90.05%