solve it using an Excel sheet

4. You decide to sell 100 shares of Topgun Enterprises Inc. short when it is selling at its yearly high of $42.25. Your broker tells you that your margin requirement is 60 percent and that the commission on the sale is $20. While you are short, Topgun pays a $0.85 per share dividend. At the end of one year you buy your Topgun shares (cover your short sale) at \$44 and are charged a commission of \$20 and a 5 percent interest rate. a. What is your dollar return on the investment? b. What is your rate of return on the investment