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3. You are bullish on PZH stock. The current market price is $100 per share, and you have $500,000 of your own to invest. You borrow an additional $300,000 from your broker at an interest rate of 2% per month and invest $800,000 in the stock. a. Suppose the price of PZH stock falls immediately after your purchase. The maintenance margin is 40%. How low can the price of PZH stock fall before you receive a margin call? b. Suppose a month has passed. What is your rate of return if the price of PZH stock has gone up by 20%? Ignore any expected dividend. (10 marks)