A certain sum at compound interest amounts to Rs. 3,025 in 2 years and to Rs. 3,327.5 in 3 years, interest compounded annually. The sum and the rate of interest p.a. are, respectively:
1
Rs. 2,200 and 10%
2
Rs. 2,000 and 8.5%
3
Rs. 2,800 and 9%
4
Rs. 2,500 and 10%