Assuming that in an economy it only produces potatoes, tomatoes and apples, and using

the following table

Production in Kes. Price of the kilogram Years potatoes tomatoes apples of the potatoe of the tomatoe of the apple 2011 21 220 45 $ 2 $ 4 $ 4 2012 25 232 46 $ 3 $ 5 $ 4 2013 28 244 47 $ 3 $ 6 $ 4 2014 30 245 50 $ 3 $ 7 $ 4 2015 31 267 55 $ 4 $7 $ 5 2016 38 270 57 $ 4 $ 8 $ 5 2017 40 272 59 $ 5 $ 8 $ 6 2018 50 278 60 $ 5 $9 $ 7 2019 55 290 70 $ 6 $ 10 $ 8 2020 67 300 75 $ 6 $ 12 $ 9