某文化用品商店计划同时购进一批A、B两种型号的计算器，若购进A型计算器10只和B型计算器8只，共需要资金880元;若购进A型计算器2只和B型计算器5只，共需要资金380只。

（1）求A、B两种型号的计算器每只进价各是多少元？

（2）该经销商计划购进这两种型号的计算器共50只，而可用于购买这两种型号的计算器的资金不超过2520元，根据市场行情，销售一只A型计算器可获利10元，销售一只B型计算器可获利15元，该经销商希望销售完这两种型号的计算器，所获利润不少于620元，则该经销商有哪几种进货方案？

下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。  

增加：在缺词处加一个漏字符号(/\)，并在其下面写出该加的词。   

删除：把多余的词用斜线(\)划掉。   

修改：在错的词下划一横线，并在该词下面写出修改后的词。   

注意：1. 每处错误及其修改均仅限一词；   

2. 只允许修改10处，多者(从第11处起)不计分。   

Every one of us can make a great efforts to cut off the use of energy in our country. To begin with, all of us can start reducing to the use of oil by driving only when you have a real need. That won't be easy, but we have to start anywhere. What's more, we can go to work by bike once and twice a week, and we can also buy smaller cars that burn more oil. Other way is to watch our everyday use of water and electric at home. For example, how many times have you walked out of a room, leaving the lights when no one’s there?