There is a batch of video disc players whose original selling price is 800 yuan each, and are sold in both home appliance stores A and B. A shopping mall uses the following methods to promote? The unit price of buying one is 760 yuan, and the unit price of buying two is 720 yuan each, and so on. Every time you buy one more unit, the unit price of each unit you buy will be reduced by 40 yuan, but the minimum price of each unit cannot be lower than 480 yuan. ; B shopping malls are all sold at 80% of the original price. If a unit buys two DVD players, which shopping mall is suitable for them? What about buying 5 units?
有一批影碟机原销售价为每台800元，在甲乙两家家电商场均有销售．甲商场用如下的方式促销？买一台单价为760元，买两台每台单价都为720元，依此类推，每多买一台则所买各台单价均再减少40元，但每台最低价不能低于480元；乙商场一律都按原价的80%销售．某单位如果买两台影碟机到哪家商场买合适？买5台呢？
<result>5</result>