The total sum of amounts of A and B at the end of 4 years and 2 years respectively on the same principal is Rs. 20,020. If A is charged Simple interest at the rate 10% and B is charged Compound interest at the rate 5%. The principal is?
1
Rs. 5,000
2
Rs. 7,500
3
Rs. 2,500
4
Rs. 8,000
5
Rs. 6,000