Economics math marginal cost question?

Allan D

New member
In a place there are some apple sellers. Each seller's marginal cost is 15$. There are no fixed costs. Each seller can sell at most 1000 apples per day.

a) If an apple's price is 20$, how many does every seller want to sell a day?

b) How many sellers can exist if the total demand for apples is given by D(p) = 70000 - 3000P (if each seller is assume to sell 1000 apples a day)?

c)
What is the equilibrium pirce?
 
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