Task: Question Answering
Input (English): Problem: a lent rs . 4000 to b for 2 years and rs . 2000 to c for 4 years on simple interest at the same rate of interest and received rs . 2200 in all from both of them as interest . the rate of interest per annum is : 
Options: a ) 14 % , b ) 15 % , c ) 12 % , d ) 13.75 % , e ) 14.56 %
Output (English): d