# Math

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Determine the future value of an annuity due into which quarterly deposits of \$450 are made for nine years if the annuity pays 10% compounded quarterly.

• Math -

The formula for determining the accumulation of a series of periodic deposits, made at the end of each period, over a given time span, an ordinary annuity, is

.......S(n) = R[(1 + i)^n - 1]/i

where S(n) = the accumulation over the period of n intervals, R = the periodic deposit, n = the number of interest paying periods, and i = the annual interest % divided by 100 divided by the number of interest paying periods per year.

When an annuity is cumputed on the basis of the payments being made at the beginning of each period, an annuity due, the total accumulation is based on one more period minus the last payment. Thus, the total accumulation becomes

S(n+1) = R[(1+i)^(n+1) - 1]/i - R
.......= R[[{(1+i)^(n+1)- 1}/i]-1]

Here, R = \$450, i = (10/100)/4 = .208333 and n = 9x4 = 36.

• Math -

Thanks tchrwill, But I'm still confused. The question has a multiply choice answer, and it's one of these:

\$26,430.20
\$29,073.31
\$26,430.25
\$27,751.79

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