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Thursday, 01 October 2026
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Economics Past Questions and Answers

Topic: Variable cost

Jamb Economics Questions - Variable cost

Question 1:
The short-run average variable cost of a firm will rise owing to
  • A The expansion of factory space
  • B The building of new warehouse
  • C An increase in the cost of labour
  • D An increase in the salaries of directors
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Question 2:
At any given level of output, a firm's total variable cost equals ?
  • A Total cost less marginal cost
  • B Total cost less total fixed costs
  • C Total cost less average cost
  • D Average variable cost and marginal cost
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Question 3:
At any given level of output, a firm's total variable cost equals ?
  • A Total cost less marginal cost
  • B Total cost less total fixed costs
  • C Total cost less average cost
  • D Average variable cost and marginal cost
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Question 4:
\(\begin{array}{c|c}
\text{Quantity of singlets} & \text{Short run total costs(N)} \\
0 & 1,000 \\
10 & 1,200 \\
20 & 1,400 \\
30 & 1,600 \\
40 & 1,800 \\
\end{array}\)
The short run total costs for different levels of output for a firm producing singlets are shown above. Calculate the variable cost per unit at an output of 20.
  • A N1000
  • B N400
  • C N70
  • D N20
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Question 5:
In the diagram below, the curve which represents firm's short-run average variable cost is curve
  • A L
  • B Ll
  • C Lll
  • D IV
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