[img]2015m7x/ct_egreqj_egreqtbz1_0110_20151[/img]From 1930 to 1990, approximate

游客2025-02-23 1

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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[img]2015m7x/ct_egreqj_egreqtbz1_0110_20151[/img]From 1930 to 1990, approximate

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在下面的图中，ABCD是长方形，AB=5，AF=7，FD=3。[img]2022m10s/ct_ve01203002j_egreqjs_0100_202211

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