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Use the demand function to write cost and revenue functions of p.

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A health club has cost and revenue functions given by C = 10,000 + 35q and R = pq, where q is the number of annual club members and p is the prices of a one year membership. The demand function for the club is q = 3000 - 20q.

a. Use the demand function to write cost and revenue functions of p.
b. Graph cost and revenue as a function of p, on the same axes. (Note that price does not go above $170 and that the annual costs of running the club reach $120,000.)
c. Explain why the graph of the revenue function has the shape it does.
d. For what prices does the club make a profit?
e. Estimate the annual membership fee that maximizes profit. Mark this point on your graph.

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Solution Summary

This solution carefully graphs cost and revenues as a function of p, on the same axes.

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a. Use the demand function to write cost and revenue functions of p.
I guess the demand function should be:
q = 3000 - 20p
Therefore,
C = 10000 + 35q = 10000 + 35 *(3000 - 20p) = 10000 + 105000 - 700p = 115000 - 700p
R = pq = p ...

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