This winter vacation, my mother and I walked in the busy street, and the promotional signs of "200 for 200" were everywhere. Consumers flock to shopping malls, which are crowded with people, and snapping up is a common occurrence. In fact, the merchants have already laid their wishful thinking in their hearts. As the saying goes, only buy at a loss, don't sell at a loss, and "sending 200 yuan coupons for over 200 yuan" is just a sales promotion method for merchants, which hides mathematical problems.

Just say that 200 yuan sent a shopping voucher to 200 yuan. My mother first bought a cashmere coat from 490 yuan and gave a shopping voucher from 400 yuan. At this time, we got a shopping voucher from 400 yuan, which gave us a feeling of bargain hunting, so we had a strong desire to buy it, and wanted to spend it as soon as possible (shopping vouchers of ordinary merchants are limited in consumption, and will expire if they are not consumed within a certain period of time). So we spent 248 yuan on a pair of shoes, and bought a scarf with 128 in the remaining 150 yuan coupon. So how much cheaper do we buy things? I calculated 128+248+490=866 (yuan), which I need to spend without any discount. 490/866, the discount is about 56%. And I think the merchants must raise the price first and then sell it, and then make a 56% discount, and the merchants still make a lot of money!