- 10%
- 22%
- 41%
- 73%

Option 3 : 41%

Stay updated with the Quantitative Aptitude questions & answers with Testbook. Know more about Interest and ace the concept of Compound Interest.

Let the number of bacteria at time 0 min be x.

∴ The number of bacteria at time 4 min becomes 4x.

Let the rate of compounding be r per minute.

⇒ 4x = x(1 + r/100)^{4}

⇒ 4 = (1 + r/100)^{4}

⇒ 1 + r/100 = 1.41

⇒ r = 41%
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