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Growth of Unattended Bacteria: How Long was the Scientist Gone?

GMAT-GJ4ZUM

A particular species of bacteria doubles its population every hour. A scientist starts with a colony of $100$ such bacteria. He leaves the lab and comes back later to find $1,500$ more bacteria than there were before.

How long was the scientist out of the lab?

A

$3$ hours

B

$3.5$ hours

C

$4$ hours

D

$5$ hours

E

$6.5$ hours