Anu invested a certain sum in schemes A and B, for 2 years, in the ratio 3 ∶ 5 respectively. Schemes A and B offer compound interest (compounded yearly) and simple interest respectively. Rate of interest in A is 20% p.a. and that in B is 5% less than that in A. If the interest received from scheme B is Rs. 900 more than that in A, then the sum invested in scheme B is :