-41.96% is the change from 877 to 509
Calculation steps:
[( 509 - 877 ) ÷ 877] x 100 = -41.96%
Formula
Percentage change = [(509 - 877) / 877] x 100
Subtract the new number by the original number
509 - 877 = -368
-368 ÷ 877 = -0.41961231470923605
-0.41961231470923605 x 100 = -41.96%