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# Shoe Repair is C(q)=100+10q-q^2+(1/3)q^3, what is the firm's marginal cost function? What is its profit-maximizing condition if the market price is p?...

If the cost function for John's Shoe Repair is C(q)=100+10q-q^2+(1/3)q^3, what is the firm's marginal cost function? What is its profit-maximizing condition if the market price is p? What is its supply curve?