Task: Question Answering
Input (English): Problem: a owes b rs . 50 . he agrees to pay b over a number of consecutive days on a monday , paying single note or rs . 10 or rs . 20 on each day . in how many different ways can a repay b . 
Options: a ) 2 , b ) 8 , c ) 9 , d ) 6 , e ) 5
Output (English): b