Wahaha mineral water is priced at 1.2 yuan per bottle. At present, a and B shopping malls offer preferential policies: 10% off for the whole market of a and 20% off for more than 20 bottles of B If you are a consumer, which shopping mall is more suitable It's a description of the situation

Wahaha mineral water is priced at 1.2 yuan per bottle. At present, a and B shopping malls offer preferential policies: 10% off for the whole market of a and 20% off for more than 20 bottles of B If you are a consumer, which shopping mall is more suitable It's a description of the situation

First of all, find out how many bottles of water to buy and spend the same money in a and B shopping malls. Set the number of bottles of mineral water as a (a > 0) 1.2 * 0.9 * a = 1.2 * 20 + 1.2 * (A-20) * 0.8 to get a = 401. When a > 40, assume that a is 50, spend 1.2 * 0.9 * 50 = 63 yuan in B shopping malls