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【OG20-P285-368题】
Max purchased a guitar for a total of $624, which consisted of the price of the guitar and the sales tax. Was the sales tax rate greater than 3 percent?
(1) The price of the guitar that Max purchased was less than $602.
(2) The sales tax for the guitar that Max purchased was less than $30.
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购买税等于用费率乘以货物价格,也就是说 sales rate*the price of the product=sales tax
条件1:设这个price是x
x<602
624-x>624-602
624-x>22
(624-x)/602>22/602
(624-x)/602>3.7%>3%,充分
条件2:设这个tax为y
y<30
y/(624-30)<30/(624-30)
y/594<5% 就是这个sales tax rate有可能大于3%,也有可能是小于3%,不充分
题目讨论 (4条评论)

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目标750
624=P+Tax,问题Tax>3%?; ;条件1:P小于602==》P最大602,Tax最小22,22/602=3%,Tax最小都是3%,充分; ;条件2:Tax小于30==》30-624=594,30/593肯定大于3.1%,Tax小于3.1%,并不知道是大于3%还是小于3%,不充分;
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0 回复 2021-06-13 21:17:23
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emily666
这种less, more的题目一定要想明白
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0 回复 2020-05-11 20:50:29
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Jess123
原价:a; 税率:t a+at=624 at<30 所以a>594, 594x0.03=17.82<30 所以:t不确定
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0 回复 2019-03-31 14:58:59
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UomoVitruviano
total 624
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0 回复 2018-10-29 19:49:37