-46.15% is the change from 390 to 210
Calculation steps:
[( 210 - 390 ) ÷ 390] x 100 = -46.15%
Formula
Percentage change = [(210 - 390) / 390] x 100
Subtract the new number by the original number
210 - 390 = -180
-180 ÷ 390 = -0.46153846153846156
-0.46153846153846156 x 100 = -46.15%