If person invested principal of Rs. (12000 - x) for 3 years at 15% rate of interest for SI in scheme A and the same person invested amount of Rs. x for 2 years at 10% rate of interest for CI in scheme B if the difference between the interest earned in the two schemes is Rs. 2760. If Principal in scheme A is reduced by 25% to find the simple interest earned for 4 years at 8% rate of interest.