Questions 7 to 8 are based on the following information: A portfolio consists of 500 shares of long position in IBM stock and 1000 shares of short position in IBM January 135 call whose delta is 0.5. Question 7 (1 point) What is the portfolio delta for this portfolio? -500 0 500 1000 Question 8 (1 point) If IBM stock price decreases by $0.50, what happens to the value of the portfolio? Portfolio value remains about the same Portfolio value decreases by roughly $250 Portfolio value decreases by roughly $500 Portfolio value increases by roughly $500