In the city of Kabwe, which has a population of 80,000 people, the number of people P(t) exposed to a rumor in t hours i

[answerhappygod]

In the city of Kabwe, which has a population of 80,000 people, the number of people P(t) exposed to a rumor in t hours is given by the function
P (t) = 80, 000 􏰀1 − e−0.0005t 􏰁
a). Find the number of hours until 10% of the population has heard the rumor.
b). Find the number of hours until 50% of the population has heard the rumor.