13. Here is the tip for you.
这里是你的小费。
还能这样说：
This is the tip for you.
This is your tip.
应用解析：
tip over 倾斜，倾倒；
tip up 付钱，付账
14. You should pay 500 Yuan after the discount.
打完折后是500元。
还能这样说：
It is 500 Yuan after the discount.
It costs you 500 Yuan after the discount.
应用解析：
heavy discount 大折扣；
volume discount 总量折扣
15. Please check out at the reception desk.
请到前台结账。
还能这样说：
You can pay your bill at the front desk.
You should settle your account at the front desk.
应用解析：
give a reception to 招待，欢迎；
hold a reception 举行欢迎会
16. You can pay the money in cash.
你可以现金付款。
还能这样说：
You can pay with cash.
Cash payment is allowed.
17. If you spend more than 500, I can give you a discount of 10%.
如果消费满500元，即可打9折。
还能这样说：
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.