Assume that the following has a linear cost function. Fixed Cost Marginal Cost per item Item Sells For $150 $9 $21 Find the following. (a) the cost function (b) the revenue function (c) the profit function (d) the profit on 103 items ... (a) The cost function is C(x) = (Simplify your answer. Do not include the $ symbol in your answer.) (b) The revenue function is R(x)= (Simplify your answer. Do not include the $ symbol in your answer.) (c) The profit function is P(x) = (Simplify your answer. Do not include the $ symbol in your answer.) (d) The profit on 103 items is S (Simplify your answer.)