In: Finance
Graham plans to save $100 each month for the next 20 years so he can purchase a boat. If he earns 10% interest annually with monthly compounding, how much money will he have at the end of 20 years if he starts saving today?
Monthly interest rate = 0.83333% per month
Time = 12* 20 = 240 months
The future value of annuity due formula is used to calculate the ending value of a series of payments or cash flows where the first payment is received immediately. The first cash flow received immediately is what distinguishes an annuity due from an ordinary annuity.
FV of annuity due = (1 + i) * P [{(1 + i) ^n -1}/i]
Where,
Periodic deposit (P) = $100
Interest rate = 0.0083333
Time (n) = 240
Let's put all the values in the formula to solve for FV of annuity due
FV of annuity due = (1 + 0.0083333) * 100 [{(1 + 0.0083333) ^240- 1}/ 0.0083333]
= (1.0083333) * 100 [{(1.0083333) ^240- 1}/ 0.0083333]
= 100.83333 *[7.32801549339119- 1/ 0.0083333]
= 100.83333 *[6.32801549339119/ 0.0083333]
= 100.83333 * 759.36489666653
= 76569.29
So the amount he will have after 20 years is $76569.29
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