-17.74% is the change from 389 to 320
Calculation steps:
[( 320 - 389 ) ÷ 389] x 100 = -17.74%
Formula
Percentage change = [(320 - 389) / 389] x 100
Subtract the new number by the original number
320 - 389 = -69
-69 ÷ 389 = -0.17737789203084833
-0.17737789203084833 x 100 = -17.74%