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priyankaparanjape
Last year, construction in the city of Vonter, including the rewiring of telephone and cable lines, caused the cost of providing cable television service to homes within the city to increase by 12 percent as compared to the previous year. In response, all cable companies in the city increased the price of their monthly service to customer. Broadcast Television Cable Company has found, however, that the proportion of cable bills paid on time decreased sharply the six months after raising the price of monthly service but returned to the previous year's level by the end of the year.

Which of the following, if true, most helps to explain the change between the first half and the second half of the year in the proportion of cable bills not paid on time to Broadcast Television Cable Company?

(C) Because Broadcast Television Cable Company provides only a premium cable package, a large portion of its subscribers who could no longer afford this package switched to another provider by the second half of the year.
Can someone pls offer better explanation?

Let I try to explain this question.

Total # of subscriber in BTCC in the 1st 6 months = 10.000
# of subscriber who pay on time in the first 6 months = 6.000
# of subscribers who pay off time in the first 6 months = 4.000 (in which, there are about 2.000 subscribers were using premium package). Then, 1.000 subscribers changed to other providers.
The proportion = 6.000/10.000 = 3/5 = 9/15

Total # of subscribers in BTCC in the last 6 months = 9.000.
# of subscriber who pay on time in the last 6 months = 6.000
# of subscribers who pay off time in the last 6 months = 3.000
The proportion = 6.000/9.000 = 2/3 = 10/15

3/5<2/3 => we get the correct answer.
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I remember that gmatclub test has a familiar question about credit, and paying debts on time between the first and the second year. The answer is that the customers, or those who own debts, no longer exist to pay the bill on time.
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