Task: Question Answering
Input (English): Problem: company x provides bottled water to its employees in 1 liter bottles , $ 2 each . at least how many 1 l bottles must company x buy monthly , so that new contract with $ 50 fixed monthly rate and $ 1 for 10 l bottle each paid off ? ( assume that no other costs apply ) 
Options: a ) 28 , b ) 29 , c ) 30 , d ) 31 , e ) 27
Output (English): e