First we have find the amount needed to withdraw $250,000 for 30 years (65 to 95) at 7% interest rate. for that use PV function in EXCEL
=PV(rate,nper,pmt,fv,type)
rate=7%
nper=30
pmt=250000
fv=0
type=0
=PV(7%,30,250000,0,0)
PV=$3,102,260.30
In the question, it mentioned that they have already 200,000 in the retirement account. This recevies 7% interest for 25 years (40-65 years)
=200000*((1+7%)^25)=1,085,486.53
So, he has to accumulate 2,016,773.77 (3,102,260.30-1,085,486.53) in 25 years. use PMT function in EXCEL
=PMT(rate,nper,pv,fv,type)
rate=7%
nper=25
pv=0
fv=2016773.77
type=0
=PMT(7%,25,0,2016773.77)
PMT=31,886.24
The annual contributions to fund the retirement account=31,886.24
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