Suppose there are only two goods (Good A and Good B) and the average person buys 4 of Good A in a year and 3 of Good B. If, in the base year, the price of Good A is $5 and the price of Good B is $10, and in the next year the price of Good A is $6 and the price of Good B is $9, the inflation that occurred in the second year is ________.