AMC 8 1985 Problem 14
AMC8 1985 年第 14 题
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The difference between a 6.5% sales tax and a 6% sales tax on an item priced at $20 before tax is
一件标价 $20 的商品，6.5% 销售税和 6% 销售税的差额是
- A.$0.01
- B.$0.10
- C.$0.50
- D.$1
- E.$10
正确答案 · Correct Answer
B
解析 · Solution
Solution 1
With a 6.5% sales tax, an item costs 1.065 times its listed price, while with a 6% sales tax, it costs 1.06 times its listed price. The difference between these prices is therefore 1.065 - 1.06 =.005 times its listed price. For this item, this difference is .
With a 6.5% sales tax, the item costs . With a 6% sales tax, the item costs . So the difference is 21.30 - 21.20 = 0.10.
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