A toy store regularly sells all stock at a discount of 20 percent to 40 percent. If an additional 25 percent were deducted from the discount price during a special sale, what would be the lowest possible price of a toy costing $16 before any discount? 求解最后一句 the lowest possible price of a toy costing $16 before any discount中有 before any discount和没有这个before any discount，表达有省么不同吗？ 195. A store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel? (A) $ 1 (B) $ 2 (C) $ 3 (D) $ 4 (E) $1 2 OG解释中假设原本单价为P，原本可买数量N，PN=120，这个“pn=120"怎么从提中知道的啊？
A toy store regularly sells all stock at a discount of 20 percent to 40 percent. 一店所有货通常都打折扣20%-40%来卖。 If an additional 25 percent were deducted from the discount price during a special sale, 如果在前面折扣基础上再加一个25%的折扣。 what would be the lowest possible price of a toy costing $16 before any discount? 那么，一实卖 $16 的货before any discount在打所有折扣前（即两次打折钱）的最低价是多少？ 其实就是一个折上再打折的情况，只不过第一次有个范围。before any discount 清楚表示了问的是所有打折前，显然是必要的啦！
请教下，怎么理解 If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $120 这句话，尤其for $120 和前面各项的关系，从而得到PN=120，(P+1)*(N-10)=120的理解？
A toy store regularly sells all stock at a discount of 20 percent to 40 percent. If an additional 25 percent were deducted from the discount price during a special sale, what would be the lowest possible price of a toy costing $16 before any discount? (A) $ 5.60 (B) $ 7.20 (C) $ 8.80 (D) $ 9.60 (E) $15.20 如果16是现在价的话，就没有正确答案啦。。。。不懂，求解
请教下，怎么理解 If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $120 这句话，尤其for $120 和前面各项的关系，从而得到PN=120，(P+1)*(N-10)=120的理解？
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发表于 2010-10-21 09:19:50
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