-55.42% is the change from 877 to 391
Calculation steps:
[( 391 - 877 ) ÷ 877] x 100 = -55.42%
Formula
Percentage change = [(391 - 877) / 877] x 100
Subtract the new number by the original number
391 - 877 = -486
-486 ÷ 877 = -0.5541619156214367
-0.5541619156214367 x 100 = -55.42%