-97.44% is the change from 390 to 10
Calculation steps:
[( 10 - 390 ) ÷ 390] x 100 = -97.44%
Formula
Percentage change = [(10 - 390) / 390] x 100
Subtract the new number by the original number
10 - 390 = -380
-380 ÷ 390 = -0.9743589743589743
-0.9743589743589743 x 100 = -97.44%