In 1970, Wal-Mart offered 300, 000 shares of its common stock to the public at a price of $16.50 per share. Since that time, Wal-Mart has had 11 two-for - one stock splits. On a purchase of 100 shares at $16.50 per share on the command's first offering, the number of shares has grown to 204, 800 shares worth $15, 767, 500 in July 2014. What is the return on investment for investors who purchased the stock in 1970 (over a 44-year ownership period)? Assume that no dividend were received during that period. The return on investment is__%. (Round to two decimal places.)