25. Pooch Barnhart purchases 100 shares of Batavia Lumber Company stock on margin at $50 per share. Simultaneously, Pooch short sells 200 shares of Geneva Shelter stock at $20 per share. With an initial margin requirement of 60%:

a. What is the initial equity (in dollars) in Pooch's account?

b. If Batavia and Geneva rise to $55 and $22 per share, respectively, what is Pooch's equity position (in dollars)?