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Consumer & Producer Surplus · Question 42 of 70

What quantity of earphones is demanded at the market price of ₹14?

Question 42

EasyOriginal question

The demand function for a brand of earphones is p=50−x2p = 50 - x^{2}, where pp is the price in rupees and xx the quantity demanded. The market price is ₹14.

What quantity of earphones is demanded at the market price of ₹14?

Options for question 42

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. 50−x2=1450 - x^{2} = 14, so x2=36x^{2} = 36.

  2. x=6x = 6.

Worth noting

36 is x2x^{2}; the quantity is its square root.

Concept
Quantity from the demand curve
Typical time
90 s
Your time
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The rule this testsConsumer surplus
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