39.56% is the change from 321 to 448
Calculation steps:
[( 448 - 321 ) ÷ 321] x 100 = 39.56%
Formula
Percentage change = [(448 - 321) / 321] x 100
Subtract the new number by the original number
448 - 321 = 127
127 ÷ 321 = 0.3956386292834891
0.3956386292834891 x 100 = 39.56%