The consumer price index for planet econ consists of only two items: books andhamburgers. 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 purchased15 books for $30 each and 30 hamburgers for $3 each. the consumer price indexfor 2015 on planet econ equals:

The consumer price index for 2015 on Planet Econ is 1.25

Explanation:

The formula for computing the consumer price index is given below:

= (Total cost in the current year) ÷ (total cost in the base year)

where,

Total cost in the current year equals to

= (Base year book quantity × current year book price) + (base year hamburgers quantity × current year hamburgers price)

= 10 books × $30 + 25 hamburgers × $3

= $300 + $75

= $375

we use the base year quantity for computing the total cost for the current year.

And, the Total cost in the base year equals to

= (Base year book quantity × base year book price) + (base year hamburgers quantity × base year hamburgers price)

= 10 books × $25 + 25 hamburgers × $2

= $250 + $50

= $300

Now put these values to the above formula

So, the answer would be

= $375 ÷ $300

= 1.25

Hence, The consumer price index for 2015 on Planet Econ is 1.25