Sam lent a sum of money at simple interest which amounted to Rs. 9800 in four years and the interest that he earned was Rs. 2800. Had he lent it at compound interest compounded annually for the same time and at the same rate, what would be the amount at the end of four years?

• A. Rs. 10500.6
• B. Rs. 10248.7
• C. Rs. 12000.9
• D. Rs. 10000.5