-7.69% is the change from 390 to 360
Calculation steps:
[( 360 - 390 ) ÷ 390] x 100 = -7.69%
Formula
Percentage change = [(360 - 390) / 390] x 100
Subtract the new number by the original number
360 - 390 = -30
-30 ÷ 390 = -0.07692307692307693
-0.07692307692307693 x 100 = -7.69%