-17.1% is the change from 386 to 320
Calculation steps:
[( 320 - 386 ) ÷ 386] x 100 = -17.1%
Formula
Percentage change = [(320 - 386) / 386] x 100
Subtract the new number by the original number
320 - 386 = -66
-66 ÷ 386 = -0.17098445595854922
-0.17098445595854922 x 100 = -17.1%