Task: Question Answering
Input (English): Problem: a sum of money becomes 7 / 6 of itself in 5 years at a certain rate of simple interest . the rate per annum is ? 
Options: a ) 20 / 7 , b ) 20 / 3 , c ) 23 / 6 , d ) 10 / 3 , e ) 10 / 7
Output (English): d