The bid and ask prices of stock A on June 1 and December 1 are as follows:Date Bid Ask. June 1 92.50 93.00 December 1 82.50 83.00

(a) If you short sell 100 shares of A on Jun 1 and cover the short position on December 1 (do not consider commission), What is your net gain or lose?

(b) If you buy 100 shares of A. on Jun 1 and sell these 100 share on December 1 (do not consider commission), what is your net gain or lose?

(c) in case (a), if the commission fee is 0.5% for both the short-sale and close of short-sale, what is your net gain or lose?

(d) in case (b), if the commission fee is 0.5% for both buy and sell, what is your net gain or lose?