-2.56% is the change from 390 to 380
Calculation steps:
[( 380 - 390 ) ÷ 390] x 100 = -2.56%
Formula
Percentage change = [(380 - 390) / 390] x 100
Subtract the new number by the original number
380 - 390 = -10
-10 ÷ 390 = -0.02564102564102564
-0.02564102564102564 x 100 = -2.56%