Help with Economics homework?

Hot Water

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If the selling price of my firm is $9 and the profit maximizing output (q*) is 80, and producing 80 units costs $800, what is the Marginal Revenue of the firm?

Also, if the selling price is now $24 as opposed to $9, and the profit maxizing (q*) is 50, and producing those 50 units cost $13 a unit, what is their Marginal Cost?

Lastly, in relation to both, how to I determine the profits of the firms?

Thanks so much for your help.
 
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