SAT Mean, Median, and Mode

What is the average (arithmetic mean) of 315,320,3^{15}, 3^{20}, and 325?3^{25}?

(A)   20\ \ 20
(B)   60\ \ 60
(C)   320\ \ 3^{20}
(D)   314+319+324\ \ 3^{14} + 3^{19} + 3^{24}
(E)   316+321+326\ \ 3^{16} + 3^{21} + 3^{26}

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