-87.44% is the change from 390 to 49
Calculation steps:
[( 49 - 390 ) ÷ 390] x 100 = -87.44%
Formula
Percentage change = [(49 - 390) / 390] x 100
Subtract the new number by the original number
49 - 390 = -341
-341 ÷ 390 = -0.8743589743589744
-0.8743589743589744 x 100 = -87.44%