# Finding the average cost?

#### CalcStudent01

##### New member
So here is the problem I am working on:

Assume that C(x) represents the cost of producing x calculators. If C(100) = $500 and C'(100) =$4.75, what is the average cost of a calculator when producing 100 calculators?

I was wondering how I should go about doing this? This is all the information I have from the math problem.

#### Subhotosh Khan

##### Super Moderator
Staff member
So here is the problem I am working on:

Assume that C(x) represents the cost of producing x calculators. If C(100) = $500 and C'(100) =$4.75, what is the average cost of a calculator when producing 100 calculators?

I was wondering how I should go about doing this? This is all the information I have from the math problem.

Please share your work with us ...even if you know it is wrong

If you are stuck at the beginning tell us and we'll start with the definitions.

http://www.freemathhelp.com/forum/th...Before-Posting

#### CalcStudent01

##### New member
What I know

Well here is what I know:
C(x) is the function that represents the cost for making x calculators.
C(100) = 500 is the cost for making 100 calculators.
C'(100) = 4.75, which is the derivative of the previous function, I believe is the profit for making each individual calculator.
I believe that the next step would be to find the derivative of the derivative, but I was never given a function to work with.