If the markup policy for the store is assumed to be linear, find a function r = m(w) that expresses the retail price r as a function of the wholesale price w and find its domain and range.
A bookstore sells a book with a wholesale price of $8 for $13.00 and one with a wholesale price of $12.00 for $18.00.
r = m(w) = 1.6w + 4; domain = [0, ?), range = [4, ?)
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A. u = - 
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