The consumer price index for Planet Econ consists of only two items: books and hamburgers. In 2018, the base year, the typical consumer purchased 10 books for $20 each and 200 hamburgers for $1 each. In 2020, the typical consumer purchased 12 books for $23 each and 300 hamburgers for $1.15 each. The consumer price index for 2020 on Planet Econ equals