-90.03% is the change from 391 to 39
Calculation steps:
[( 39 - 391 ) ÷ 391] x 100 = -90.03%
Formula
Percentage change = [(39 - 391) / 391] x 100
Subtract the new number by the original number
39 - 391 = -352
-352 ÷ 391 = -0.9002557544757033
-0.9002557544757033 x 100 = -90.03%