2. Morning in the store. At what price should a mixture of two types of candies be sold if the price of the first type is 10 rubles per kilogram, the second type is 15 rubles per kilogram, and the weight of the first type of candies is three times greater than that of the second?
2. Let $3 x$ kg be the weight of candies of the first type, then their total cost is $45 x$ rubles, and the weight is $4 x$ kg. They should be sold at a price of $\frac{45 x}{4 x}$ rubles, that is, at 11 rubles and 25 kopecks per 1 kg.