Official Explanation
What follows from the statistics about annual household incomes in the two counties? We can infer that in Merton County, the percentage of households with incomes above $40,000 is higher than in Sommer County. Therefore, the percentage with incomes below $40,000 must be lower. And we are told that the percentage with incomes above $60,000 is also lower in Merton County than in Sommer County. Since the percentage with incomes below $40,000 and the percentage with incomes above $60,000 are both lower in Merton County than in Sommer County, the remaining percentage, with incomes between $40,000 and $60,000, must be higher in Merton County than in Sommer County.
A We have no information about the percentage of households with incomes of $80,000 or higher in either county. It’s even possible that no household in either county has an income of $80,000 or higher.
B Some third county could also have a higher percentage of households with incomes above $60,000 than Merton County does, even though Merton County has the highest percentage of households with incomes above $40,000.
C Correct. This can be deduced as explained above.
D We have no information about the total numbers of households in the two counties, only about the percentages with different income levels.
E Since a higher percentage of households in Sommer County than in Merton County have incomes below $40,000, average annual household income might also be lower in Sommer County.
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