-42.25% is the change from 871 to 503
Calculation steps:
[( 503 - 871 ) ÷ 871] x 100 = -42.25%
Formula
Percentage change = [(503 - 871) / 871] x 100
Subtract the new number by the original number
503 - 871 = -368
-368 ÷ 871 = -0.4225028702640643
-0.4225028702640643 x 100 = -42.25%