offered annunity that pays 3.9 % compound monthly. What equal monthly deposit should be made into this annunity in order to have $79,000 in 18 years?
+37146 Assuming this is an annuity due (payments at beginning of month)
FV = P [(1+i)n -1]/i * (1+i) i = .039/12 n = 18 yr * 12 months/yr = 216
P = 252.01
+324 Sorry, I don't get the problem that well. Here is my best shot at it:
There are 18 years and 12 months in each year. In order to calculate the amount warned per month, we will have to compute: \((75000/18)/12 \implies 9875/27\)
After doing this, set x as the amount that has to be paid: \(.039x=9875/27\)
Then just compute:\(x=9377.9677113\)
Note: Electric Pavlov's answer is far more likely to be correct, so if ours are different, go with his/her's
+118673 Hi Naci,
This question is very poorly worded. The meaning must be guessed.
My guess:
An annuity pays 3.9 % (yearly and nominal (the effective rate is a little higher), compound monthly.
What equal monthly deposit should be made into this annuity in order (at the beginning of each month?) to have $79,000 at the end of 18 years?
Anyway:
Your answer is far too simplistic. The money is going into an account each month and staying there for for 18 years.
18*12=216months 3.9/12=0.325% = 0.00325 interest per month
Assuming that the first installment is paid AT THE BEGINNING of the first month AND P dollars are deposited each month, then
the first deposit will grow to P(1.00325)^216
the second deposit will grow to P(1.00325)^215
...
the last deposit will grow to P(1.00325)^1
You know that this will add to $79000 so you can solve it as a GP (assuming you know about GPs geometric progressions)
There are also formulas, that I have forgotten, EP has used a financial mathematics formula.
Hi Melody: EP's calculation is correct if monthly payments are made at the beginning of each month.
FV=79000; R=0.039/12; N=18*12;PMT = FV*(((1 + R)^N - 1)^-1* R);print" PMT =$",PMT
PMT =$ 252.83 - Monthly payments made at the end of each month
PMT =$ 252.01 - Monthly payments made at the beginning of each month.
