<prompt> If annual growth rate of population is 1.2, the population is likely to get doubled in:18--20 years20--23years28--35 years47 -- 50 years  <response>: Rate Annual GR Yrs required Stationary No growth - Slow growth 0.5 139 Moderate growth 0.5-1 139-70 Rapid growth 1-1.5 70-47 Very rapid growth 1.5-2 47-35 Explosive growth 2-2.5 35-28 Explosive growth 3-3.5 23-20 Explosive growth 3.5-4 20-18 