-28.46% is the change from 390 to 279
Calculation steps:
[( 279 - 390 ) ÷ 390] x 100 = -28.46%
Formula
Percentage change = [(279 - 390) / 390] x 100
Subtract the new number by the original number
279 - 390 = -111
-111 ÷ 390 = -0.2846153846153846
-0.2846153846153846 x 100 = -28.46%