-41% is the change from 878 to 518
Calculation steps:
[( 518 - 878 ) ÷ 878] x 100 = -41%
Formula
Percentage change = [(518 - 878) / 878] x 100
Subtract the new number by the original number
518 - 878 = -360
-360 ÷ 878 = -0.41002277904328016
-0.41002277904328016 x 100 = -41%