22.43% is the change from 321 to 393
Calculation steps:
[( 393 - 321 ) ÷ 321] x 100 = 22.43%
Formula
Percentage change = [(393 - 321) / 321] x 100
Subtract the new number by the original number
393 - 321 = 72
72 ÷ 321 = 0.22429906542056074
0.22429906542056074 x 100 = 22.43%