Task: Question Answering
Input (English): Problem: in assembling a bluetooth device , a factory uses one of two kinds of modules . one module costs $ 10 and the other one , that is cheaper , costs $ 3.5 . the factory holds a $ 45 worth stock of 11 modules . how many of the modules in the stock are of the cheaper kind ? 
Options: a ) 30 , b ) 28 , c ) 25 , d ) 20 , e ) 10
Output (English): e