13. Here is the tip for you.
這里是你的小費。
還能這樣說：
This is the tip for you.
This is your tip.
應用解析：
tip over 傾斜，傾倒；
tip up 付錢，付賬
14. You should pay 500 Yuan after the discount.
打完折后是500元。
還能這樣說：
It is 500 Yuan after the discount.
It costs you 500 Yuan after the discount.
應用解析：
heavy discount 大折扣；
volume discount 總量折扣
15. Please check out at the reception desk.
請到前臺結賬。
還能這樣說：
You can pay your bill at the front desk.
You should settle your account at the front desk.
應用解析：
give a reception to 招待，歡迎；
hold a reception 舉行歡迎會
16. You can pay the money in cash.
你可以現金付款。
還能這樣說：
You can pay with cash.
Cash payment is allowed.
17. If you spend more than 500, I can give you a discount of 10%.
如果消費滿500元，即可打9折。
還能這樣說：
If it costs you more than 500, there is a discount of 10%.
I can discount you at 10% in case that you spend 500 Yuan.