39.37% is the change from 221 to 308
Calculation steps:
[( 308 - 221 ) ÷ 221] x 100 = 39.37%
Formula
Percentage change = [(308 - 221) / 221] x 100
Subtract the new number by the original number
308 - 221 = 87
87 ÷ 221 = 0.3936651583710407
0.3936651583710407 x 100 = 39.37%