problem belongs to percentages
A man borrowed Rs.60,000 at simple interest, but at different rates for different periods. The rate of interest for the first three years was 6% p.a.; for the next two years it was 7% p.a. for the next four years it was 8% p.a. and for the 10th year it was 9% p.a. He made a partial repayment of Rs.35,000 at the end of four years. If he wants to clear his loan at the end of 10 years, how much should he pay?