-90.99% is the change from 877 to 79
Calculation steps:
[( 79 - 877 ) ÷ 877] x 100 = -90.99%
Formula
Percentage change = [(79 - 877) / 877] x 100
Subtract the new number by the original number
79 - 877 = -798
-798 ÷ 877 = -0.9099201824401368
-0.9099201824401368 x 100 = -90.99%