Question 1 In 2019 and in 2021, consumers bought only books and pens, and the table shows the data. 2019 2021 Item Price Quantity Price Quantity Books $2 7 $6 6 Pens $6 4 $8 8 The reference base period is 2019, and 2019 is also the year of the Consum Expenditure Survey. Calculate the CPI in 2021.

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