Answer:
We can use the formula for simple interest to solve this problem:
Simple Interest = (P * R * T) / 100
where P is the principal amount, R is the rate of interest, and T is the time period in years.
Let's assume that the time period required to get Rs. 1200 from Rs. 1000 at 10% rate of interest is T months. We need to convert T from months to years by dividing it by 12.
1200 - 1000 = (1000 * 10 * T) / (100 * 12)
200 = (1000 * 10 * T) / 1200
T = (200 * 1200) / (1000 * 10)
T = 24 months
Therefore, it will take 24 months (or 2 years) for an amount of Rs. 1000 at a rate of 10% to become Rs. 1200.
Thank you.