Task: Question Answering
Input (English): Problem: nitin borrowed some money at the rate of 6 % p . a . for the first 3 years , 9 % p . a . for the next 5 years and 13 % p . a . for the period beyond 8 years . if the total interest paid by him at the end of 11 years is rs . 8160 , how much money did he borrow ? 
Options: a ) 8000 , b ) 2787 , c ) 27766 , d ) 9976 , e ) 21671
Output (English): a