Suresh borrowed some money at the rate of 12% p.a. for the first three years, 9% p.a. for the next five years and 13% p.a. for the period beyond eight years. If the total interest paid by him at the end of 11 years is Rs.8160, how much money did he borrow?  Choose the correct option
A) s.8500
B) s.6000
C) s.6800
D) s.9000
E) s.7000
using the formula S.I=P*T*R/100   (x*12*3/100)+(x*9*5/100)+(x*13*3/100)=8160   x=6800   i.e money borrowed is Rs.6800   ANSWER:s.6800
<result>C</result>
Suresh borrowed some money at the rate of 12% p.a. for the first three years, 9% p.a. for the next five years and 13% p.a. for the period beyond eight years. If the total interest paid by him at the end of 11 years is Rs.8160, how much money did he borrow?