Profit Function Suppose that the revenue R, in dollars, from selling x clocks is R (x) = 30x. The cost C, in dollars, of selling x clocks is C (x) =0.1x2 + 7x + 400.
(a) Find the profit function, P(x) = R (x) - C (x) .
(b) Find the profit if x = 30 clocks are sold.
(c) Interpret P(30).
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