The consumer price index for Planet Econ consists of only two items: books and hamburgers. In 2000, the base year, the typical consumer purchased 10 books for $25 each and 25 hamburgers for $2 each. In 2005, the typical consumer purchased 15 books for $30 each and 30 hamburgers for $3 each. The consumer price index for 2005 on Planet Econ equals:

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

Suppose that a candy maker owns a building and is renting part of the building's space to a doctor. further suppose that because the candy maker is the owner, he has the right to make noise during the day while he makes candy. while the doctor cannot insist on a quiet environment, the doctor could move to a quieter building. however, rent in the next best building is $350/month more than rent in the noisy building. the candy maker can adopt a new technology that eliminates the noise for $275/month. given this situation, can the doctor find a private solution with the candy maker that will make both better off?