Consider a simple economy where a typical consumer buys dog food and Apple pencils each year. Assume the base year is 2017 and that consumers purchase the same quantity of each good in 2017 and 2018. The table provides all of the information ---however, to do so, need to fill in the empty cells. What is the CPI for this economy in 2018? a)100 b)105.42 c)121.2 d)113.33