Correct Answer - Option 3 :

\(2\frac {6}{7}\) years

**Given:**

Principal = Rs. 3500

Amount = Rs. 4500

Rate of interest = 10% p.a

**Formula:**

SI = Prt/100

**Calculation:**

SI = Rs. 4500 - Rs. 3500

SI = Rs. 1000

According to the formula:

1000 = (3500 × 10 × t)/100

⇒ t = 1000/350

⇒ t = \(2\frac {6}{7}\) years

**∴ In \(2\frac {6}{7}\) years Rs. 3,500 invested at the rate of 10% simple interest per annum, shall amount to Rs. 4,500.**