走在大街上,我们时常会听到或看到商店招徕顾客的许诺或广告,什么有奖销售、大酬宾、八折优惠、买一送一等等.那么这些商家是否无利可图了呢?我们有必要了解一点物价方面的数学知识.现以部分中考题为例. 例1 某商场把彩电按标价的九折出售,仍可获利20％.若该彩电的进价是2400元,问标价应为多少? Walking on the street, we often hear or see the shops attracting customers’ promises or advertisements, what prize sales, big bargains, discounts, buy one get one, and so on. So are these businesses unprofitable? We need to understand a bit of mathematics knowledge about prices. Now take some of the exam questions as an example. Example 1 A mall that sells color TV at a 10% discount on the list price can still make a profit of 20%. If the purchase price of the color TV is 2,400 yuan, Ask how much the price should be?