-20.6% is the change from 403 to 320
Calculation steps:
[( 320 - 403 ) ÷ 403] x 100 = -20.6%
Formula
Percentage change = [(320 - 403) / 403] x 100
Subtract the new number by the original number
320 - 403 = -83
-83 ÷ 403 = -0.20595533498759305
-0.20595533498759305 x 100 = -20.6%