Not sure what I am doing wrong..
Terry makes and sells necklaces. He has observed over time that when the price is $ 9 each, he sells an average of 30 per day. If he increases the price, then his average sales fall by 3 per day for each dollar increase. The materials for each necklace cost $8. Express his profit P as a function of x, the number of necklaces sold.
What I have:
Profit function is revenue minus cost. Thus:
And R(x)= P*Q Where P is Price and Q is quantity.
What am I missing?