**Question **# The population of the world in 1800 was 0.9 billion. a. What exponential rate of growth would have resulted in the population in 1960, which was 3billion? (Answer:r = 7.5*103 yr') b. At this growth rate, what is the doubling time for this population? (Answer: Td = 92.4 yrs) C.If this rate continued, what would the population have been in the year 2015? d. Is your answer for part c) larger or smaller than the actual world population in 2015? What does this result mean in terms of how the rate of growth changed between 1800-1960 and1960-2015?