Task: Question Answering
Input (English): Problem: after giving a discount of rs . 45 the shopkeeper still gets a profit of 20 % , if the cost price is rs . 180 . find the markup % ? 
Options: a ) 0.4 , b ) 0.55 , c ) 0.45 , d ) 0.48 , e ) 0.58
Output (English): c