Task: Question Answering
Input (English): Problem: company x provides bottled water to its employees in 5 liter bottles , $ 5 each . at least how many 5 l bottles must company x buy monthly , so that new contract with $ 40 fixed monthly rate and $ 2 for 20 l bottle each paid off ? ( assume that no other costs apply ) 
Options: a ) 4 , b ) 9 , c ) 12 , d ) 20 , e ) 25
Output (English): b