中国大学MOOC: 15.You have to stop here. No one is allowed to enter without the___________.

Which<br/>one of the following statements is correct if you purchase an item<br/>with credit terms of 2/5, net 15?() A: If<br/>you pay within two days, you will receive a 5 percent discount. B: If<br/>you pay within 2 to 5 days, you will receive a 15 percent discount. C: If<br/>you do not pay within 5 days, you will be charged interest at a 15<br/>percent annual <br/>rate. D: If<br/>you pay within 5 days, you will receive a 2 percent discount. E: You<br/>must pay the discounted amount within 15 days.

When we receive the goods you return to us, you ______ a full refund within 15 days.

How much tip can you give the waiter or waitress after you meal in an American restaurant A: [A] Only 15% of your bill is all right. B: Generally speaking, about 15% of your bill is Ok, but sometimes you can leave the tip depending on the service given. C: Usually, ＄15 is enough.

Questions 13 to 15 are based on the conversation you have just heard.

Questions 13 to 15 are based on the passage you have just heard.

You have $5,000 you want to invest for the next 45 years. You are offered an investment plan that will pay you 6 percent per year for the next 15 years and 10 percent per year for the last 30 years. How much will you have at the end of the 45 years? How much will you have if the investment plan pays you 10 percent per year for the first 15 years and 6 percent per year for the next 30 years?

How many flowers you should take when you visit a British friend? A: 6 B: 15 C: 13 D: 12

When it is advisable to change to another VHF channel, for example channel 15, you should say:

中国大学MOOC: A: Are you catching the 13:15 flight to New York?B: No, ___________ this morning.