You short sold 500 shares of Jasper stock at $45 a share at an initial margin of 60 percent. What is the highest the stock price can go before you receive a margin call if the maintenance margin is 40 percent? Rudolfo purchased 900 shares of stock for $62.20 a share and sold them ten months later for $64.60 a share. The initial margin requirement on this stock is 75 percent and the maintenance margin is 40 percent. Ignoring dividends and costs, what is his holding period return