You paid cash for $1,400 worth of stock a year ago. Today the portfolio is worth $2,134. Required: a. What rate of return did you earn on the investment? (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) Rate ofretum % b. Now suppose that you bought the same stock but bought it 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 the rates of return for a cash purchase in the event that the stock is worth $950 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 $950 today (Negative value should be Indicated by a minus sign. Round your answer to 2 decimal places.) Rate of return MacBook Air DI 19 AM a TO 56 64 S % A & +