math

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im doing corespondence and i tried for days to figure this out and i cant can anyone help??
Determine the amount of each investment? $400 at 9% compounded semi-annually for 2 years i just need that answer and how too get it then i can do them thank you

  • math -

    All calculations are based on the assumption that $400 is the initial
    investment. If that is not true,let
    me know and I'll redo the cal. based
    on the new INFO.

    Pt = Po * (r + 1)^n

    r = ((9 / 12)/ 100) * 6 = 0.045 = Semi-
    annual rate expressed as a decimal
    n = 2 yr. / 0.5 = 4 = The number of
    compounding periods.
    Pt = 400 * (0.045)^4 = 477.01 = The
    value of the investment after 2 yrs.

  • math -

    i don't understand still please help with showing how you got that answer thank you

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