Chapter 4.1, Problem 10E

Reminder Round all answers to two decimal places unless otherwise indicated.

Doubling Time The current world population is about $7.3\text{billion}$. Under current conditions, the population is growing exponentially, with a yearly growth factor of $1.011$. In parts b and c, round your answers to the nearest year.

a. Find a formula that gives the world population $N$, in billions, after $t\text{years}$.

b. How long will it take for the population to double?

c. How long after doubling will it take for the population to double again?