The opportunity cost for producing 1 unit of apparel is higher for China, therefore China should produce apparel and the US should produce chemicals.
It should be noted that opportunity cost simply means the real cost of forgone alternative.
Without trade, China was producing 64000 units of apparel and 32 tons of chemicals. After specialization, China produces 144000 of apparel and US produces 144 tons of chemicals.
The gains from trade will be:
= 144000 - 64000
= 80000 apparels
The tons of chemicals will be:
= 144 - 32
= 112 tons of chemicals.
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