jan purchased 100 shares of peach computer stock for $18 per share, plus a $45 brokerage commission. every 6 months she received a dividend from peach of 50 cents per share. at the end of 2 years, just after receiving the fourth dividend, she sold the stock for $23 per share and paid a $58 brokerage commission form the proceeds. what annual rate of return did she receive on her investment?