assume that only two goods are produced in an economy, a and b. in the base year, 6 units of a are produced at a price of $3 and 5 units of b are produced at a price of $2. and in the given year, 6 units of a are produced at a price of $2 and 5 units of b are produced at a price of $6. what is the cpi for the given year? 150 66.67 52.83 178 120