Suppose that the stock market has been rising fairly rapidly and you decide to "go on margin" by borrowing some money from your broker. Start with an assumption that the return on stocks will be 10% per year. What is your profit in the first year on the money you have invested (not including the borrowed money) if: a. You start with $1,000 b. You can borrow half of the $1,000 with interest rates of 5% or 12%? c. What is your "break-even" point with each of the two rates of interest on the borrowed money? d. How much profit do you have for each rate of interest if the stock market (and your stock!) goes up by 20% or 30%?