Multiple Choice

-The diagram above shows the individual demand curves for individual A (DA) and individual B (DB) for a garden,with various areas.The marginal cost of the garden is $8 per square metre.If the garden is a public good,what is the optimal size of the garden?
A) 60 square metres.
B) 42 square metres.
C) 36 square metres.
D) 24 square metres.
E) 18 square metres.
Correct Answer:
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