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单选题 The income tax requires that taxpayers pay 10% on the first $40,000 of income and 20 percent on all income over $40,000. Karen paid $6,000 in taxes. What were her marginal and average tax rates
A. 20 percent and 12 percent, respectively
B. 20 percent and 15 percent, respectively
C. 10 percent and 12 percent respectively
D. 10 percent and 15 percent respectively

学科:默认课程
时间:2025-12-23 06:28:25
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