The demand for beans in bags is given by the function Q - 36 + 0.4P = 0.

Where P is price in naira and Q is quantity.

Find Q when P = 20 naira.

  • A 12 bags
  • B 24 bags
  • C 28 bags
  • D 30 bags
waec 2007economics

The correct answer is C. 28 bags

The demand for beans in bags is given by the function Q - 36 + 0.4P = 0, where P is the price in naira and Q is the quantity demanded. 

We need to find Q when P = 20 naira.

To find Q, we can substitute P = 20 into the demand function and solve for Q:

Q - 36 + 0.4(20) = 0

Q - 36 + 8 = 0

Q - 28 = 0

Q = 28

Therefore, when the price of beans in bags is 20 naira, the quantity demanded is 28 bags. 

So the correct answer is C. 28 bags

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