- Rs.3900
- Rs.3993
- Rs.4500
- Rs.3200

Option 2 : Rs.3993

**Formula:**

Let P = Principle, R = rate of interest and N = time

Compound interest (annually) = P(1 + R/100)^{N} - P

**Calculation:**

Let sum invested be Rs.P.

⇒ 300 = P(1 + 10/100) - P

⇒ P = 3000

Sum invested is Rs.3000.

**∴ Amount earned after 3 years = 3000(1 + 10/100) ^{3} = Rs.3993**

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