Assume that apples cost $0.50 in 2002 and $1 in 2009, whereas oranges cost $1 in 2002 and $0.50 in 2009. If 10 apples and 5 oranges were purchased in 2002, and 5 apples and 10 oranges were purchased in 2009, the CPI for 2009, using 2002 as the base year, is:

Group of answer choices

0.75.

1.25.

0.80.

1.