Chapter 12.7, Problem 8ES

(a)

To determine

To calculate: The time when the number of people who have heard the rumor reaches to 1000 people provided that the number of people who have heard the rumor after $t$ days is $N\left(t\right)=20{\left(3\right)}^t$.

b)

To determine

To calculate: The doubling time for the number of people who have heard the rumor for the model $N\left(t\right)=20{\left(3\right)}^t$.