20% is the change from 320 to 384
Calculation steps:
[( 384 - 320 ) ÷ 320] x 100 = 20%
Formula
Percentage change = [(384 - 320) / 320] x 100
Subtract the new number by the original number
384 - 320 = 64
64 ÷ 320 = 0.2
0.2 x 100 = 20%
Example