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If demand function for a product is Qd = 30 - 4P, and the price...

Economics
JAMB 2023

If demand function for a product is Qd = 30 - 4P, and the price and quantity of products is 4 and 14 respectively. What is the price elasticity of demand for the product?

  • A. 1.14
  • B. 7.1
  • C. 14.1
  • D. 1.7
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Correct Answer: Option A
Explanation

Q = 14, P = 4

Qd = 30 - 4p

∆q/∆p = - 4
 

Ed = \(\frac{∆q}{∆p}\times\frac{p}{q}\)


= - 4 x 4/14

= Ed = -1.14
since price elasticity is positive, then Ed = 1.14


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