-42.65% is the change from 877 to 503
Calculation steps:
[( 503 - 877 ) ÷ 877] x 100 = -42.65%
Formula
Percentage change = [(503 - 877) / 877] x 100
Subtract the new number by the original number
503 - 877 = -374
-374 ÷ 877 = -0.4264538198403649
-0.4264538198403649 x 100 = -42.65%