Symmetric Difference or Derivative

[Xfree]

I am trying to solve for MC, what function in Excel could I use for symmetric
difference or derivative?

MC=∆(VC)/∆(q)=∆ or MC=dTC/dQ

 

[Gary''s Student]

If the values of Q are in column A and the values of VC are in column B, then
in C2 enter:

=(A3-A1)/(B3-B1) and copy down

Column C will be an estimate of the derivaitve

 

[Xfree]

Thank you for the help!

If the values of Q are in column A and the values of VC are in column B, then
in C2 enter:

=(A3-A1)/(B3-B1) and copy down

Column C will be an estimate of the derivaitve