Task: Question Answering
Input (English): Problem: if â € œ * â €  is called â € œ + â €  , â € œ / â €  is called â € œ * â €  , â € œ - â €  is called â € œ / â €  , â € œ + â €  is called â € œ - â €  . 240 * 80 / 60 + 40 / 10 = ? 
Options: a ) - 2305 , b ) - 2407 , c ) 2509 , d ) - 2101 , e ) none of these
Output (English): b