Task: Question Answering
Input (English): Problem: a certain bag contains 100 balls â € ” 50 white , 25 green , 10 yellow , 7 red , and 8 purple . if a ball is to be chosen at random , what is the probability that the ball will be neither red nor purple ? 
Options: a ) 0.9 , b ) 0.85 , c ) 0.6 , d ) 0.8 , e ) 0.5
Output (English): b