From the given information we need to find the present value of given annuity
Pmt = Periodic monthly payment = 4500
i = Mortgage interest rate per period = 5% = 5/100 = 0.05 => 0.05/12 = 0.00416667
when calculation for 15 years then 15 x 12 = 180
n = Number of payments =180
we can use below formula
PV = Pmt x [(1 - 1 / (1 + i)n)] / i
PV = 4500 x [(1 - 1 / (1 + 0.00416667)180)] / (0.00416667)
PV = 4500 X [(1-1/(1.00416667)180)]/(0.00416667)
PV = 4500 X [1-1/(2.1137)]/(0.00416667)
PV = 4500 X [1-0.4731]/(0.00416667)
PV = 4500 X [0.5269]/(0.00416667)
PV = 4500 X 126.4559
PV = 569051.55
So the present value of annuity = $569051.55
So the required amount at the time of retirement we need $569051.55 for monthly we can draw $4500 for 15 years
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