The world\'s population 10,000 years ago has been estimate at about 5 million. a) What exponential rate of growth would have resulted in the population in 1850, which is estimated at 1 billion? b)Had the rate continued, what would be the population have been in the year 2000? Solution a) Nt=N0*e(r*t) Nt = Future Population N0 = Starting population r = growth rate t= number of years. a)1000000000 = 5000000 *2.71828 ^(r*10000) r = .052% b) N2000 = 1000000000 *2.71828 ^ (.052% * 150) Population in 2000 = 1082713077.65.