-3.08% is the change from 390 to 378
Calculation steps:
[( 378 - 390 ) ÷ 390] x 100 = -3.08%
Formula
Percentage change = [(378 - 390) / 390] x 100
Subtract the new number by the original number
378 - 390 = -12
-12 ÷ 390 = -0.03076923076923077
-0.03076923076923077 x 100 = -3.08%