20.63% is the change from 320 to 386
Calculation steps:
[( 386 - 320 ) ÷ 320] x 100 = 20.63%
Formula
Percentage change = [(386 - 320) / 320] x 100
Subtract the new number by the original number
386 - 320 = 66
66 ÷ 320 = 0.20625
0.20625 x 100 = 20.63%