Nelson borrowed some money at the rate of 6 p.c.p.a. for the first three years, 9 p.c.p.a. for the next five years and 13 p.c.p.a. for the period beyond eight years. If the total interest paid by him at the end of eleven years is 8,160, how much money did he borrow? Select the correct option
A) 12,000  B) 10,000  C) 8,000  D) Data inadequate  E) None of these
Let ‘x’ be the amount borrowed by Nelson   and x×6×3/100+x×9×5/100+x×13×3/100=8160   ⇒ 102⁄100x = 8,160   ∴ x = 8,160×100102=8000   Answer 8,000
<result>C</result>
Nelson borrowed some money at the rate of 6 p.c.p.a. for the first three years, 9 p.c.p.a. for the next five years and 13 p.c.p.a. for the period beyond eight years. If the total interest paid by him at the end of eleven years is 8,160, how much money did he borrow?