The stock of Shamrock Corporation is selling at $30 a share. You submit a market order to buy 100 shares of Shamrock. Immediately after your market order is executed, you submit a stop loss limit order for 100 shares with a stop price of $20. During the next few days, the stock price declines gradually to $15, and then increases gradually to $60. Ignore broker commissions. What would be your total rate of return on this investment?