# Calculus Maximizing Profit

xmf77
Homework Statement:
For a monopolist's product,

the demand equation is

p=30−2q

and the average-cost function is

c=2+40q.

Find the profit-maximizing price.
Relevant Equations:
Calculus, maximizing, profit, price
I know the formula profit = (price-cost)quantity.
but when ı applied the numbers ı can not substitute them
profit = ((30-2q-2-(40/q))

but don't know what ı need to do ?
would appreciate any help given please.

Homework Helper
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Homework Statement:: For a monopolist's product,

the demand equation is

p=30−2q

and the average-cost function is

c=2+40q.

Find the profit-maximizing price.
Relevant Equations:: Calculus, maximizing, profit, price

I know the formula profit = (price-cost)quantity.
but when ı applied the numbers ı can not substitute them
profit = ((30-2q-2-(40/q))

but don't know what ı need to do ?
would appreciate any help given please.
You need to express your profit equation in terms of price, not in terms of demand.

xmf77
İs there anyone?