Derivative of 500 ln(x+1)

d/dx 500*ln(x+1)=
500* d/dx ln(x+1)=
500*d/dy ln(y) * d/dx (x+1) (chain rule)[where y=x+1]=
500*1/(x+1)*d/dx x + d/dx 1=
500/(x+1)*1=
500/(x+1)