Toyota will bring hybrid electric automobiles to market next year priced at ​$27 comma 000 ​(this includes a ​$6 comma 750 federal tax​ credit). At ​$1.89 per gallon of​ gasoline, it will take 11 years to recoup the difference in price between a base model Toyota Camry and its​ four-cylinder gasoline-only counterpart. The price difference is ​$4 comma 180. If the hybrid vehicle is driven for 15 ​years, what is the internal rate of return on the extra investment in the​ hybrid?