-90.21% is the change from 807 to 79
Calculation steps:
[( 79 - 807 ) ÷ 807] x 100 = -90.21%
Formula
Percentage change = [(79 - 807) / 807] x 100
Subtract the new number by the original number
79 - 807 = -728
-728 ÷ 807 = -0.9021065675340768
-0.9021065675340768 x 100 = -90.21%