Alex is examining a portfolio that contains 100 stocks that are either value or Growth. Out of these 100 stocks 40% are value stock. The previous portfolio manager had selected 70% of the value stocks and 80% of the growth stocks. What is the probability of selecting a stock at random that is either a value stock or was selected by previous portfolio manager?

A) 28

B) 76

C) 88

Plz guide me to understand this question.