Here, the deposits will be same every semi annual year, so it is an annuity.Here we will use the future value of annuity formula as per below:
FVA = P * ((1 + r)n - 1 / r)
where, FVA is future value of annuity, P is the periodical amount = $400, r is the rate of interest = 4% compounded semi annually, so semi annual rate = 4% / 2 = 2% and n is the time period = 19 * 2 = 38 semi annual years
Now, putting these values in the above formula, we get,
FVA = $400 * ((1 + 2%)38 - 1 / 2%)
FVA = $400 * ((1 + 0.02)38- 1 / 0.02)
FVA = $400 * ((1.02)38 - 1 / 0.02)
FVA = $400 * ((2.1222987924- 1 / 0.02)
FVA = $400 * (1.1222987924/ 0.02)
FVA = $400 * 56.11493962
FVA = $22445.98
So, future value is $22445.98.
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