The total revenue received from the sale of x units of a product is given by R(x) = 3x^2 + 36x + 5. What is the marginal revenue when x = 15?
Answer and explanation
Correct answer: B. 126
- Step 1: Marginal revenue MR = dR/dx.
- Step 2: dR/dx = 6x + 36.
- Step 3: For x = 15: MR = 6(15) + 36 = 90 + 36 = 126.
Why not the others: The alternative choices (116, 136, 106) stem from algebraic sign mistakes, misapplying coordinate formulas, or intermediate arithmetic calculation slips.
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