Sumita took a loan at simple interest rate of 5% in the first year and it increased of 2% p.a. every year. If she pays Rs. 9000 as interest at the end of 4 years what was her loan amount?
Rs.28125
x×5×1100 + x×7×1100 + x×9×1100 + x×11×1100 = 9000
x = Rs.28125