-28.02% is the change from 389 to 280
Calculation steps:
[( 280 - 389 ) ÷ 389] x 100 = -28.02%
Formula
Percentage change = [(280 - 389) / 389] x 100
Subtract the new number by the original number
280 - 389 = -109
-109 ÷ 389 = -0.2802056555269923
-0.2802056555269923 x 100 = -28.02%