What else , Ma'am ?   No , thanks . My husband said , We'd like to pay now .   Let me show you to the cashier's . It's 905 yuan in total .   What ? Where does that five come from ?   Oh , it's a service charge .   But I only have 900 in cash here . Can you let it go for 900 yuan ?   Sorry , but we can't do that . It's store's rule . 