-91.86% is the change from 479 to 39
Calculation steps:
[( 39 - 479 ) ÷ 479] x 100 = -91.86%
Formula
Percentage change = [(39 - 479) / 479] x 100
Subtract the new number by the original number
39 - 479 = -440
-440 ÷ 479 = -0.918580375782881
-0.918580375782881 x 100 = -91.86%