Challenge problems 35. For which investment(s) can we determine a yield before buying: (a) stock, (b) bond, (c) mutual fund, (d) promissory note? 36. You bought 30 shares of a stock at a price of $16.78 per share and incurred brokerage fees totaling $40. Six year later, you sold the stock at a price of $14.80 per share and incurred brokerage fees totaling $55. Calculate your rate of return. 37. Refer to Problem 36. Assume you received dividends of $1.25 per share at the end of each year; you received your sixth annual dividend immediately before selling the stock. Calculate your rate of return. 38. Refer to Problem 37. Assume you received dividends of $46 at the end of year 1, $65 at the end of year 2, nothing at the end of years 3-5, and $74 at the end of year 6 (just before you sold the stock). Calculate your rate of return. 39. Your grandmother invested $500 in a mutual fund 30 years ago. All earnings have been reinvested. Her mutual fund balance is now $18,763. What average annual rate of return has the f