The first question. The first type: because the total amount is 550,000. According to the meaning of the question, each car is 70,000 yuan, and each van is 40,000 yuan. So if you buy a whole car, you can buy at most 55 divided by 7=7 cars, so there is still 55-49 = 60,000 yuan left at this time. In other words, you can buy a van at this time. The second type: buy 12 van (12 times 400 = 480,000), and 550,000-480,000 = 70,000 (just enough to buy a car). The second question. Adopt the second method: buy 12 van (12 times 4 = 480,000) and just buy a car (55-48 = 70,000). At this time, the maximum rent is: 12 times10 =13201320+200 =1520 yuan, and the rent of the first method is: 7 times 200 =/kloc-.