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?

A、 3
B、 10
C、 65
D、 98
E、 120

【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 slightly less than 10% of 29,000,000, the total revenue must have been just under 100 times greater than the number of widgets sold.

填空题 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?

单选题 The percent decrease in average number of production hours per widget from 1990 to 2000 was approximately

A、 44%
B、 36%
C、 34%
D、 32%
E、 27%

【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 difference between the starting value and ending value (9-5) by the starting value:

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?

A、 Four
B、 Three
C、 Two
D、 One
E、 None

【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).