Question

A population of 7000 fruit flies is dying off at a rate of 8% per minute. How long will it take for only 700 fruit flies to remain alive?

Answer 1

After t minutes, there are 0.92^t of the original population alive. So, just solve

7000 * 0.92^t = 700
0.92^t = 0.1
t log 0.92 = log 0.1
t = 27.6

Answer 2

Thank you!