Neha invested Rs. 50,000 in two different schemes, ‘C’ and ‘D’, for 3 years and 4 years, respectively. Scheme ‘C’ offers a simple interest rate of 15% per annum, while scheme ‘D’ provides compound interest (compounded annually) at a rate of 25% per annum. Determine the sum invested in scheme ‘D’ if the interest from scheme ‘C’ is Rs. 2,250 more than that from scheme ‘D’.