If yield is 5% , the maximum amount she can withdraw is $7,900 for next fifteen years.
If yield is 8%, the maximum amount she can withdraw is $9,580 for next fifteen years.
Given a specific rate of return, or discount rate, an annuity's present value is the current worth of its expected future payments. The present value of the annuity decreases with increasing discount rates. A succession of future annuities' present values are determined using the annuity's present value interest factor. Its foundation is the time value of money principle, according to which a sum of money acquired today is worth more than the same sum received at a later time.
The PV of final annuity
PV = A[ (1+r)ⁿ - 1/ r(1+r)ⁿ]
PV = $82,000
r = 5 rpa
r = 15 years
So, $82,000 = A [tex]\frac{(1+0.05)-1}{0.05(1+0.05)^{15} }}[/tex]
$82,000 = A[tex][\frac{1.07893}{0.10395}][/tex]
$82,000 = A [[tex]\frac{82,000}{10.3793}[/tex]]
A = $ 7900
So she can withdraw $7900 for next 15 years.
If yield is 8%
So, $82,000 = A [tex]\frac{(1+0.08)^{15}-1}{0.08(1+0.08)^{15} }}[/tex]
$82,000 = A[tex][\frac{2.17217}{0.25377}][/tex]
$82,000 = A [8.5596]
A = [tex]\frac{82000}{85596}[/tex]
= $ 9.580
So she can withdraw $9,580 for next 15 years.
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