Sol :
PMT = $30,000
Interest rate (r) = 7%
Period (n) = 20 years
a) To determine amount needed in account (PV) at the beginning as follows,
Present value (PV) = PMT x (1-(1/(1+r)^n)/r
PV = $30,000 x (1-(1/(1+7%)^20)/7%
PV = $30,000 x (1-(1/(1.07)^20)/0.07
PV = $317,820.43
b) Total money will you pull out of the account,
= Withdrawal per year x number of years
= $30,000 x 20 = $600,000
c) Interest amount will be = Total withdrawal - PV
= $600,000 - $317,820.43 = $282,179.57
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