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.
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Question: Article: In Western countries people have been using the installment plan since the first half of the twentieth century. Today, a large number of families in Great Britain buy furniture, household goods and cars by installments .In the U.S., the figure is much higher than in Great Britain, and people there spend over 10 percent of their income on the installment plan. The price of an article bought on installments is always higher than the price that would be paid by cash. There is a charge for interest. The buyers pays one quarter or one third of the price as a down payment when the goods are delivered to him. He then makes regular payments, weekly or monthly, until the full price is paid up. The legal ownership of the goods remains with the seller until the final payment has been made. Installment buying has advantages and disadvantages. It can help couples with small incomes to furnish their homes and start housekeeping, It increases the demand for goods, and in this way helps business and employment. There is ,however, the danger that when business is bad, installment buying may end suddenly, making business much worse. This may result in a great increase in unemployment. If the people on the installment plan lose their jobs, they will probably not be able to make their payments. If great numbers of people are not able to pay their installment debts there is a possibility that businessmen cannot collect their debts and will therefore lose money. If businessmen lose money or fail to make a satisfactory profit, it becomes more likely to have a depression. This is why, in some countries, the government controls the installment plan by fixing the amount of the down payment to discourage people from buying more than they can pay for on the installment plan.
Answer: The payment of installment buying is easier than buying by cash.

Answer: Which of the following is true about the installment plan?

Question: Article: As a young girl, Margaret "Mattie" Knight never played with dolls, preferring to make toys for her brothers instead. In 1849, Knight went to work in a cotton factory where she witnessed a "shuttle," a device that carries thread back and forth across a textile loom , fly off the machine when the thread broke, striking and killing a young boy about her own age. The 12-year-old Knight developed a safety mechanism that made it impossible for a shuttle to leave the loom. The design was so effective, soon virtually every new power loom carried her invention, saving countless workers from injury or death. Being so young, she didn't bother to patent the device, so she never received payment. Knight wouldn't make the same mistake later in life when she invented a machine that could produce flat-bottomed paper bags. Knight had built a small wooden model in her home, but she needed a metal version to show it could hold up to the stress of mass production. So she hired Charles Annan to make the full-sized machine for her, only to have him try to claim the patent for himself. When Knight sued , Annan's argument was that the design had to be his, because no woman could possibly understand the complex mechanics. Knight proved him wrong when she brought back her wooden prototype and explained how every part worked. She won the case in 1871, making her the second woman to hold an American patent. Over a hundred years later, her design is still used as the basis for many modern flat-bottom bag machines. But that wasn't the last the world heard of Mattie Knight. During her lifetime, she made about 90 inventions and received 26 patents, becoming one of the most productive female inventors of the 19th century.
Answer: It reduced injuries at textile plants.

Answer: What do we know about Knight's first invention?

Question: Article: From early times, man has been interested in art. People have often worked together to collect and save the world's art treasures. Fine art treasures from many countries are kept in an art museum called the Louvre in Paris, France. The works of art have been collected by the people of France over many centuries. It is the biggest art museum in the world. The Louvre has not always been a museum. The first building was a fort. In 1190, it was the king's castle with high walls and a round tower, which had a river around it to keep out the enemies. Over the years, the number of buildings around the castle grew. By 1350, the castle no longer needed a fort. The Louvre became a palace home for French kings and queens. During times of peace, new treasures were brought in. During the days of war, many treasures were stolen, and the buildings were damaged. When Francis I became king of France in 1515, he brought in many artists from other countries. One of the artists was Lenardo da Vinci from Italy. Da Vinci's "Mona Lisa" is the best known painting in the museum today. In 1793, the Louvre became a public museum. It is a place where art treasures are kept for everyone to enjoy. Every year millions of people from all over the world come to the Louvre to see the masterpieces.
Answer: For over 200 years

Answer:
How long has the Louvre been a museum?