The Consumer Price Index for Planet Econ Consists of Only

The consumer price index for Planet Econ consists of only two items: books and hamburgers.In 2010, the base year, the typical consumer purchased 10 books for $25 each and 25 hamburgers for $2 each.In 2015, the typical consumer purchased 15 books for $30 each and 30 hamburgers for $3 each.The consumer price index for 2015 on Planet Econ equals:

A) 1.00
B) 1.15
C) 1.25
D) 1.45