单选题 When we "bargain", we discuss the price of something. Normally the buyer wants to get things cheaper and the seller wants to sell things at a higher price. This is where bargaining begins. Do you know how to bargain? Here are some tips to help you. • Firstly, you should know where to bargain. Some places, like outdoor markets, are good for bargaining. Other places, like department stores, are not good. • Secondly, you should always use cash when you bargain. You can often get a lower price if you pay in cash. • Thirdly, you should try to get the right discount. If you ask for 50% off, you might make the seller angry. Try starting from 25% off and if that doesn't work, move down to 20%, 15% and then 10%. • Finally, don't be afraid to walk away! Sometimes the seller will give you a lower price when he / she sees you are leaving小题:How many tips did the writer put forward in the passage