IBPS RRBs Officer Scale I 06 Sep 2015 Paper

A sum of Rs. 2000 was invested for 2 years in scheme A which offers simple interest at the rate of 15% p.a. The amount received after 2 years with some additional money, is then invested in scheme B, for 2 years, which offers compound interest (compounded annually) at the rate of 20% p.a. If the compound interest received from scheme B after 2 years is Rs. 1507, what was the additional money invested in scheme B apart from the amount received from scheme A ?