48. Let f(a) be the cost in dollars of a pounds of organic Granny Smith apples at Walmart in Apr

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48. Let $f(a)$ be the cost in dollars of $a$ pounds of organic Granny Smith apples at Walmart in April 2017. Explain what the following statements tell you. What are the units of each of the numbers? (a) $f(2) = 4.44$ (b) $f(0.5) = 1.11$ (c) $f^{-1}(2.22) = 1$ (d) $f^{-1}(11.10) = 5$