Task: Question Answering
Input (English): Problem: a person lent a certain sum of money at 4 % per annum at simple interest and in 8 years the interest amounted to rs . 170 less than the sum lent . what was the sum lent ? 
Options: a ) 228 , b ) 278 , c ) 250 , d ) 500 , e ) 821
Output (English): c