Task: Question Answering
Input (English): Problem: the rate of interest on a sum of money is 3 % p . a . for the first 3 years , 4 % p . a . for the next 4 years , and 5 % for the period beyond 7 years . if the s . i , occurred on the sum for the total period of 8 years is rs . 540 / - , the sum is 
Options: a ) 1,200 , b ) 1,800 , c ) 2,100 , d ) 2,250 , e ) 2,540
Output (English): b