39.88% is the change from 321 to 449
Calculation steps:
[( 449 - 321 ) ÷ 321] x 100 = 39.88%
Formula
Percentage change = [(449 - 321) / 321] x 100
Subtract the new number by the original number
449 - 321 = 128
128 ÷ 321 = 0.3987538940809969
0.3987538940809969 x 100 = 39.88%