题目内容：

qing bang wo fan yi yi xia hao ma?
H:yes.howmuch is this backpack,piease?
SA:It's75yuan.
H:that's too expensive.
SA:What about this one?It's cheap.Tt's only 50 yuan.
H:Good!I'll take this pen,too.How much is it altoge ther?
SA:It's 55 yuan.
Thank you!I also want a pair of running shoes.Where can I find them?
sa:They' re on the 2nd floor.
H:Thank you!
bang wo fan yi yi xia