The current market price of UNH stock is $100 per share and you have $10,000 of your own to invest. You borrow an additional $10,000 from your broker at an interest rate of 5% per year and invest $20,000 in the stock. Your rate of return will be % if the price goes up to $104 during the next year? (Please keep 2 decimal places for example, input 2.31 for 0.0231)