-96.92% is the change from 390 to 12
Calculation steps:
[( 12 - 390 ) ÷ 390] x 100 = -96.92%
Formula
Percentage change = [(12 - 390) / 390] x 100
Subtract the new number by the original number
12 - 390 = -378
-378 ÷ 390 = -0.9692307692307692
-0.9692307692307692 x 100 = -96.92%