-90.82% is the change from 839 to 77
Calculation steps:
[( 77 - 839 ) ÷ 839] x 100 = -90.82%
Formula
Percentage change = [(77 - 839) / 839] x 100
Subtract the new number by the original number
77 - 839 = -762
-762 ÷ 839 = -0.9082240762812872
-0.9082240762812872 x 100 = -90.82%