(a)A Speculate.com customer is considered "active" if s/he executes at least one trade per day. September 2003 records indicate that 20% of customers were "active" and that one-quarter of "active" customers outperformed S&P 500 index during that period. On the other hand, one-third of the "nonactive" customers outperformed S&P 500 index during that period. What percentage of customers who outperformed S&P 500 index in September 2003 were "active" customers in that month? (7 points)