2. 外语
  3. From 1930 to 1990, approximately what was the average increase per year in per capita income?

From 1930 to 1990, approximately what was the average increase per year in per capita income?

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问题
From 1930 to 1990, approximately what was the average increase per year in per capita income?
选项 A、$150
B、$200
C、$250
D、$300
E、$350
答案D
解析 For the 60-year period from 1930 to 1990, the per capita income increased by $24,230 - $6,610, or $17,620. The average annual increase is, which is approximately, or $300.(Since the choices are quite far apart, there is no need for an accurate calculation.)The correct answer is Choice D.
This explanation uses the following strategies.
Strategy 4: Translate from a Figure to an Arithmetic or Algebraic Representation
Strategy 9: Estimate
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