It is the most economical to rent bus No.8 and bus 1. According to the relevant public information, the idea to solve the problem is 258+2=260 people, 260÷30 = 8 people or more, and the remaining 20 people just fill a small bus, so it is concluded that renting 8 buses and 1 bus is the most economical. The topic comes from a math exam in the fourth grade of primary school. The full topic is: the bus is limited to 30 people, the rent is 600 yuan, the passenger car is limited to 20 people, and the rent is 450 yuan. Two teachers took 258 students to rent a car. How to rent a car is the cheapest.