You paid cash for $800 worth of stock a year ago. Today the portfolio is worth $450 What rate of retum did you eam on the investment (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places) Rate of return b. Now suppose that you bought the same stock but bought on margin. The initial margin requirement was 55. Recalculate your rate of return, ignoring any interest due. Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) Rate of return c. Recalculate themes of return for a cash purchase in the event that the stock is worth $750 today Negative value should be indicated by a minus sign. Round your answer to 2 decimal places) Rate of return d. Recalculate the rates of return for a margin purchase in the event that the stock is worth $750 today Negative value should be indicated by a minus sign. Round your answer to 2 decimal places) Rate of return