1. The problem statement, all variables and given/known data For a monopolist's product, the demand equation is: p = 42 - 4q and the average-cost function is c = 2 + (80/q) Find the profit-maximizing price. 2. Relevant equations When i started to solve the problem, i deduced from what i needed to find that I needed to make up a function, plugging in the above functions into profit = (price-cost)quantity. To what extent I'm correct I'm not sure. 3. The attempt at a solution I tried plugging it in like this: profit = ((42-4q-2-(80/q)) all that multiplied by q. I dont seem to know if i multiply that whole equation just by q, or by finding a formula for q from those other functions they already gave me. I tried it and it gave me q= 80/(c-2) but then, do i have to substitute c in that formula. I really dont know where to go from here. would appreciate any help given please.