a) You open up a 60% margin account to purchase $10,000 worth of IBM stock at $50 per share. Ignoring any interest charges for the margin account, at what price will the margin account be called, if the maintenance level is 25%? b) This time you decide you want to short the IBM stocks from part 1. The initial margin and maintenance margins are still the same. If the stock price rises to $55, what is your return? a) You open up a 60% margin account to purchase $10,000 worth of IBM stock at $50 per share. Ignoring any interest charges for the margin account, at what price will the margin account be called, if the maintenance level is 25%? b) This time you decide you want to short the IBM stocks from part 1. The initial margin and maintenance margins are still the same. If the stock price rises to $55, what is your return