单选题
单选题 In 1990, the total revenue for widgets sold was about how many times as great as the number of widgets sold?
【正确答案】 D
【答案解析】According to the graphs, in 1990 total revenue was $29 million and the number of widgets sold was 295,000. Because 295,000 is about I percent of 29,000,000, the total revenue must have been about 100 times greater than the number of widgets sold.
单选题 In 1970, if the cost to produce one widget was $0.07, what would have been the total cost to produce the number of widgets sold during that year?
【正确答案】 D
【答案解析】According to the graphs, in 1970, 325,000 widgets were sold; at $0.07 per widget, the total cost would have been 325,000($0.07), or $22,750.
单选题 The percent decrease in average number of production hours per widget from 1990 to 2000 was approximately
【正确答案】 A
【答案解析】According to the graphs, from 1990 to 2000, the average number of production hours per widget decreased from 9 to 5. To calculate the percent decrease, divide the starting value (9) by the difference between the starting value and ending value (9-5):
[*] which is equivalent to 44%
单选题 In how many of the years shown was the number of widgets sold at least three times the number of widgets sold in 1960?
【正确答案】 D
【答案解析】The first step in solving this problem is to calculate three times the number of widgets sold in 1960. According to the graphs, the number of widgets sold in 1960 was 115,000; 115,000(3)=345,000. The only year in which more than 345,000 widgets sold was 1980 (490,000 widgets sold).
单选题 Which of the following statements can be inferred from the data?
I. The greatest increase in total yearly revenue over any 10-year period shown was $7 million.
II. In each of the 10-year periods shown in which total yearly revenue increased, the average number of production hours per widget decreased.
III. From 1980 to 1990, fewer widgets were sold because each widget took longer to produce.
【正确答案】 B
【答案解析】According to the graphs, the greatest increase in total yearly revenue over any 10-year period shown was $10 million—from 1970 to 1980. Therefore, Roman numeral I is not true, and you can eliminate answer choices A and D, which include Roman numeral I. According to the graphs, from 1960 to 1970 and from 1970 to 1980, total yearly revenue increased while average production hours per widget decreased; therefore, Roman numeral II is true. Eliminate answer choice C because it does not include Roman numeral II According to the graphs, from 1980 to 1990, the number of widgets sold decreased while the average number of production hours per widget increased; you might be tempted to infer that the reduced number of widgets sold was due to the increased production time, but there could have been other factors that you are not aware of; therefore, you cannot safely accept Roman numeral III as true. Eliminate answer choice E.