32.09% is the change from 321 to 424
Calculation steps:
[( 424 - 321 ) ÷ 321] x 100 = 32.09%
Formula
Percentage change = [(424 - 321) / 321] x 100
Subtract the new number by the original number
424 - 321 = 103
103 ÷ 321 = 0.32087227414330216
0.32087227414330216 x 100 = 32.09%