40.19% is the change from 321 to 450
Calculation steps:
[( 450 - 321 ) ÷ 321] x 100 = 40.19%
Formula
Percentage change = [(450 - 321) / 321] x 100
Subtract the new number by the original number
450 - 321 = 129
129 ÷ 321 = 0.40186915887850466
0.40186915887850466 x 100 = 40.19%