22.81% is the change from 320 to 393
Calculation steps:
[( 393 - 320 ) ÷ 320] x 100 = 22.81%
Formula
Percentage change = [(393 - 320) / 320] x 100
Subtract the new number by the original number
393 - 320 = 73
73 ÷ 320 = 0.228125
0.228125 x 100 = 22.81%