A country's population in 1965 was 12.4 million and it was growing at 3% per year. Assume no net migration. If necessary, round answers to 2 decimal points. Show all work. (10 points total) a. In about how many years will it take for this country's population to double? (5 points) b. In the year 2000, this country's population had increased to 32 million. Calculate the average annual growth rate of the population over this time period.