-95.24% is the change from 820 to 39
Calculation steps:
[( 39 - 820 ) ÷ 820] x 100 = -95.24%
Formula
Percentage change = [(39 - 820) / 820] x 100
Subtract the new number by the original number
39 - 820 = -781
-781 ÷ 820 = -0.9524390243902439
-0.9524390243902439 x 100 = -95.24%