You decide to sell short 100 shares of Charlotte Horse Farms when it is selling at its yearly high of R56. Your broker tells you that your margin requirement is 45 percent and that the commission on the purchase is R155. While you are short the stock, Charlotte pays a R2.50 per share dividend. At the end of one year, you buy 100 shares of Charlotte at R45 to close out your position and are charged a commission of R145 and 8 percent interest on the money borrowed. What is your rate of return on the invesmtment