4. Countries A, B and C produce only watermelons (X) and grapefruits (Y). The production
possibility frontiers are given by: XA + YA = 100, 2XB +3YB = 300, XC +2YC = 600. What is the
maximum amount of watermelons that they can produce together if they want to produce at least
200 grapefruits?
(A) 200
(B) 500
(C) 600
(D) None of the above
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