Let R(x), C(x), and P(x) be, respectively, the revenue, cost, and profit, in dollars, from the production and sale of x items. If R(x) = 4x and C(x) =0.002x + 1.2x + 70, find each of the following. a) P(x) b) R(200), C(200), and P(200) c) R'(x), C'(x), and P'(x) d) R'(200), C'(200), and P'(200) a) P(x) = (Use integers or decimals for any numbers in the expression.) b) R(200) = $ (Type an integer or a decimal.) C(200) = $ (Type an integer or a decimal.) P(200) = $ (Type an integer or a decimal.) c) R'(x) =(Type an integer or a decimal.) C' (x) =_ (Use integers or decimals for any numbers in the expression.) P' (x) =0 (Use integers or decimals for any numbers in the expression.) d) R'(200) = $ per item (Type an integer or a decimal.) C'(200) = $ per item (Type an integer or a decimal.)