# Help needed

#### CRoss

##### New member

Last edited by a moderator:

#### Subhotosh Khan

##### Super Moderator
Staff member
Please show us what you have tried and exactly where you are stuck.

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#### Dr.Peterson

##### Elite Member
Actually, the problem tells you what the equation for the average cost, not total cost, is. This problem is just a matter of solving the given equation, $$\displaystyle \frac{7377+ 40x}{x}= 120$$ for x. I would start by multiplying both sides by x to get $$\displaystyle 7377+ 40x= 120x$$ and solve that.