P2.6 Black Star Inc.'s stock is currently selling at $20 per share. For each of the following situa- tions (ignoring brokerage commissions), calculate the gain or loss that Priscilla Moyo realizes if she makes a 100-share transaction. a. She sells short and repurchases the borrowed shares at $15 per share. b. She takes a long position and sells the stock at $25 per share. c. She sells short and repurchases the borrowed shares at $25 per share. d. She takes a long position and sells the stock at $20 per share.