In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Let me give you an example: Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
The answer to this example can be: How many books are there in the British Library?
Here is why: In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

OK. solve this:
Article: When I paid for the bicycle repair, the repairman told me, " No change, Professor Pan. We're friends." "I'd rather pay," I replied. "If it's free, I can't afford it." Chinese often refuse payment for professional services, insisting, "We're friends now!" But then they show up later to ask me to tutor them in English, or get them into an American university, and I wish I'd have just paid the 30 yuan I owed them in the first place. According to the Americans, "There's no free lunch," meaning that there's a price for everything, and I'm always looking around to figure out what this means. Many of our neighbors have given us fruit or flowers or costly teas, never asking anything in return. For years, a bicycle repairman has repeatedly refused to let me pay him. "Wait until you have something major to fix!" he insists. Chinese generosity is a real education for Americans like me, who would rather avoid social entanglements and just hand over the money. But cash can't make up for the greatest gift - friendship. When an American saw some of my friends sitting on bamboo stools under the trees, sipping tea, he said, "They must have nothing better to do." "Actually," I said, "they are professors, with plenty to do. But probably you're right in saying that, at this moment, they have nothing better to do. And neither do I." And I joined the group. We chatted about tea and Chinese cooking and how much my boys have grown since we arrived. One man said, "They were pocket-sized when you came here. Now they're taller than you. How time flies." How life flies. And Chinese are smart enough to share what they know they cannot keep. They freely give of their time, never too busy to help a friend. And they are teaching me, slowly, to both give and receive. So the next time someone says, "No charge. We're friends." I will thank them heartily. But if they show up later asking me to tutor them in English, I'll make sure they tutor my son in Chinese as well, because there's still no free lunch.
Answer: Because he didn't want to help others in return.
Answer:
Why did the author insist on paying the repairman while he was offered free repairs?