Explanation24. 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 \(\frac{$17620}{60}\) which is approximately \(\frac{$18000}{60}\), or $300. (Since the choices are quite far apart, there is no need for an accurate calculation.) The correct answer is
Choice D.25. The table shows that in 1950 the revenue per student was $1,330. As a percent of the per capita income of $9,540, this is \(\frac{1330}{9540}*100%\), which is approximately 13.9%. Of the given choices, the closest is 14%. The correct answer is
Choice C.
26. For most of the years, a rough estimate of \(\frac{1}{5}\) of the per capita income is sufficient for the
comparison to the revenue per student. For the years 1930, 1940, 1950, and 1960, you might estimate of the per capita incomes as $1,300, $1,400, $2,000, and $2,500, respectively, which are clearly greater than the corresponding revenues per student.
For 1980 and 1990, your estimates might be $4,000 and $5,000, which are less than the corresponding revenues per student.
For 1970, you do have to calculate \(\frac{$17,340}{5} = $3468\) which is greater than $3,440.
So the revenue per student was less than of the per capita income for the five years 1930, 1940, 1950, 1960, and 1970. The correct answer is
Choice E.
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