-28.64% is the change from 391 to 279
Calculation steps:
[( 279 - 391 ) ÷ 391] x 100 = -28.64%
Formula
Percentage change = [(279 - 391) / 391] x 100
Subtract the new number by the original number
279 - 391 = -112
-112 ÷ 391 = -0.2864450127877238
-0.2864450127877238 x 100 = -28.64%