If a process kills 90% of the organisms per minute, how many minutes would it take to kill all organisms when starting with 100,000 organisms?
A) 6 minutes
B) 3 minutes
C) 2 minutes
D) 1 minute
E) 60 minutes

Question

Quizplus · Accepted Answer

After 1 minute, 90% of the organisms will be killed, leaving 10,000 organisms. After 2 minutes, 90% of the remaining organisms will be killed, leaving 1,000 organisms. After 3 minutes, 90% of the remaining organisms will be killed, leaving 100 organisms. After 4 minutes, 90% of the remaining organisms will be killed, leaving 10 organisms. After 5 minutes, 90% of the remaining organisms will be killed, leaving 1 organism. After 6 minutes, the remaining organism will be killed.

If a Process Kills 90% of the Organisms Per Minute