12. Assume that two countries A and C can produce both timber and cars. The country A can produce 20
units of timber or 8 units of cars in one week； the country C can produce 15 units of timber or 4 units
of cars in one week. If A and C trade to each other, for the country A, what is the possible terms of
trade?
(A) 4
(B) 3
(C) 0.4
(D) 0.33
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