Use an annual growth rate of 1.5 % in a 10 year period for a certain population to find the approximate doubling time and then predict the population in 2050, based on a 2000 population of 5.0 billion.

What is the approximate doubling time? _____ years (Round to the nearest whole number as needed.)

What will be the approximate population in 2050? _____ billion (Round to the nearest tenth as needed.)