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A school group has $600 to spend on T-shirts. The group is buying from a store that gives them a $5 discount off the regular price per shirt. n=600p-5 gives the number of shirts, n, that can be purchased at a regular price, p. p=600n+5 gives the regular price, p, of a shirt when n shirts are bought. What is n when p is 20? What is p when n is 40? Is one function an inverse of the other? Explain how you know.