Four months ago, Freda purchased 500 shares of stock on margin at a price per share of $35. The initial margin requirement on her account is 70 percent and the maintenance margin is 40 percent. The call money rate is 4.75 percent and the broker charges a spread of 2.0 percent above that rate. Today, she sold these shares for $37.50 each. What is her (effective) annualized rate of return? (Hint: Remember that you only pay interest on the loan for the fraction of a year that you borrow the funds. Also, when calculating the effective annual return, you need to calculate how many holding periods occur during a one-year period.) 23.58% 27.78% 30.43% 9.26% O 12.47%