-99.23% is the change from 390 to 3
Calculation steps:
[( 3 - 390 ) ÷ 390] x 100 = -99.23%
Formula
Percentage change = [(3 - 390) / 390] x 100
Subtract the new number by the original number
3 - 390 = -387
-387 ÷ 390 = -0.9923076923076923
-0.9923076923076923 x 100 = -99.23%