阅读文章回答问题

    This is Hong Kong Middle School. It is very big and beautiful. There are 34 classes, 300 teachers and 3, 500 students in the school. In the middle of the school there is a tall building. It's for us to have classes. All the classrooms are there. There are some small rooms, too. They are offices for the teachers to work. All the teachers get ready for their lessons there.

    In front of the tall building, there is a small one. It is the library. There are many books there. The teachers and the students like to read books in it. Sometimes they borrow(借)books from it.

    There is a dining hall behind the tall building. Some of the students have lunch in it.

    I like my new school very much.

某文具零售店准备从批发市场选购A、B两种文具，批发价A种为12元/件，B种为8元/件．若该店零售A、B两种文具的日销售量y（件）与零售价x（元/件）均成一次函数关系．（如图）

（1）求y与x的函数关系式；

（2）该店计划这次选购A、B两种文具的数量共100件，所花资金不超过1000元，并希望全部售完获利不低于296元，若按A种文具每件可获利4元和B种文具每件可获利2元计算，则该店这次有哪几种进货方案？

（3）若A种文具的零售价比B种文具的零售价高2元/件，求两种文具每天的销售利润W（元）与A种文具零售价x（元/件）之间的函数关系式，并说明A、B两种文具零售价分别为多少时，每天销售的利润最大？

材料  张骞通西域后，绵延数千里的漫长古道——丝绸之路贯穿欧亚大陆，成为中外交往的见证。到了唐朝时期，中外文化的交流与传播进入繁盛时期。1405——1433年郑和七次下西洋，加强了我国与亚非国家的经济文化交流。