4.a. If Ruth's demand curve for saving Indiana bats is P=2000 - 2Q, and John's demand curve is

P=1000 - Q, and they are the only two people in this society, what is the total demand for Indiana bats? (Assume saving Indiana bats is a public good)

b. If the cost for saving each Indiana bat is $100, how many Indiana bats should be saved (from society's point of view)?

c. How would your answers to a) and b) change if there were 9 other people with the same demand as Ruth (and Johnis no longer living there) - therefore demand is based on 10 people with individual demand curves of P=200 - 2Q.