Correct Answer - Option 1 : 1 year

**Given :**

Principal amount = 10,000

Rate = 20%

Amount received = Rs. 12000

**Formula :**

Amount = P(1 + r/100)^{t}

**Calculations :**

Let the tenure be t years

⇒12000 = 10000(1 + 20/100)^{t}

⇒ 12000 = 10000(1+ 1/5)^{t}

⇒ 6/5 = (6/5)^{t}

⇒ t= 1

**∴ He invested his money for 1 year.**