100% is the change from 221 to 442
Calculation steps:
[( 442 - 221 ) ÷ 221] x 100 = 100%
Formula
Percentage change = [(442 - 221) / 221] x 100
Subtract the new number by the original number
442 - 221 = 221
221 ÷ 221 = 1
1 x 100 = 100%
Example