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Rate of Change, Marginal Cost & Revenue · Question 57 of 79

Question 57

MediumOriginal question

Each unit sells at p=120−3xp = 120 - 3x rupees when xx units are sold. What is the marginal revenue when 15 units are sold?

Options for question 57

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. R(x)=120x−3x2R(x) = 120x - 3x^{2}, so MR=120−6xMR = 120 - 6x.

  2. At x=15x = 15: 120−90=30120 - 90 = 30 rupees.

Worth noting

₹75 is the price at 15 units; ₹−3 differentiates the price instead of the revenue.

Concept
Marginal revenue from a demand function
Typical time
90 s
Your time
—
The rule this testsMarginal revenue
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