If the interest rate is 5%, which of these investments would you prefer?
A payment of $51 a year for 20 years starting at the end of 1st year.
A payment of $614 today.
A single payment of $607 at the end of 1st year.
An ordinary perpetuity of $29.
The present value of option 1 is computed as follows:
Present value = Annual payment x [ (1 – 1 / (1 + r)n) / r ]
= $ 51 x [ (1 - 1 / (1 + 0.05)20 ) / 0.05 ]
= $ 51 x 12.46221034
= $ 635.57
Present value of option 2 will be $ 614 since the same is received today
Present value of option 3 will be as follows:
= $ 607 / 1.05
= $ 578.10
Present value of option 4 will be as follows:
= Amount / interest rate
= $ 29 / 0.05
= $ 580
Since the present value of option 1 is the largest, hence same shall be preferred
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