31. If the population is 300 million, with 70 million under the age of 16 and institutionalized, another 70 million not in the labor force, 10 million unemployed and 150 million employed, the labor force participation is _______.
(A) 6.67 percent.
(B) 69.6 percent.
(C) 50 percent.
(D) 23.3 percent.
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題目解析 這道題目要求計算勞動力參與率...
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