Please answer the given financial question based on the context.
Context: performance graph the following graph compares the total return , assuming reinvestment of dividends , on an investment in the company , based on performance of the company's common stock , with the total return of the standard & poor's 500 composite stock index and the dow jones united states travel and leisure index for a five year period by measuring the changes in common stock prices from december 31 , 2012 to december 31 , 2017. .
||12/12|12/13|12/14|12/15|12/16|12/17|
|royal caribbean cruises ltd .|100.00|142.11|251.44|313.65|260.04|385.47|
|s&p 500|100.00|132.39|150.51|152.59|170.84|208.14|
|dow jones us travel & leisure|100.00|145.48|169.28|179.27|192.85|238.77|
the stock performance graph assumes for comparison that the value of the company's common stock and of each index was $ 100 on december 31 , 2012 and that all dividends were reinvested . past performance is not necessarily an indicator of future results. .
Question: what is the mathematical mean for all three investments as of dec 31 , 2017?


Answer: The answer is:277.46