9.1. In a supermarket, there are two types of fruit sets for sale. The first type of set consists of 3 apples and 15 oranges and costs 360 rubles. The second type of set consists of 20 apples and 5 oranges and costs 500 rubles. Fruits are sold only in sets, and sets cannot be divided. Seryozha came to the supermarket and wants to buy an equal number of apples and oranges. What is the smallest amount of money he will have to spend, if he cannot leave without buying anything?