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)1 minute
B)2 minutes
C)3 minutes
D)6 minutes

Question

Quizplus · Accepted Answer

Since 90% of the organisms are being killed per minute, this means that 10% of the organisms will remain after each minute. Therefore, the number of remaining organisms after each minute can be calculated as follows:
After 1 minute: 100,000 x 0.1 = 10,000
After 2 minutes: 10,000 x 0.1 = 1,000
After 3 minutes: 1,000 x 0.1 = 100
After 4 minutes: 100 x 0.1 = 10
After 5 minutes: 10 x 0.1 = 1
After 6 minutes: 1 x 0.1 = 0.1 or rounding off to 0
Therefore, it would take 6 minutes for all organisms to be killed.

If a Process Kills 90% of the Organisms Per Minute,how