Task: Question Answering
Input (English): Problem: a man purchased 3 blankets @ rs . 100 each , 2 blankets @ rs . 150 each and two blankets at a certain rate which is now slipped off from his memory . but he remembers that the average price of the blankets was rs . 150 . find the unknown rate of two blankets ? 
Options: a ) 278 , b ) 900 , c ) 278 , d ) 450 , e ) 772
Output (English): b