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A local bank advertises the following deal: ""Pay us $100 a year for 10 years and then we will pay you (or your beneficiaries) $100 a year forever."" Is this a good deal if the interest rate is 6%?

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3 votes

Answer: The answer is $16,666.6, it is a good deal of investment

Step-by-step explanation:

Using the formula Present Value (PV) of perpetuity = R/i

n= 1

Where R= The receipt for payment and

i = The rate of interest per compounding period

Since n = 10, i = 6% (6 ÷ 100) = 0.06

i = 0.06 ÷ 10

= 0.006

Using the value in the formula we get

PV of perpetuity = 100 ÷ 0.006

= $16,666.6

It is a good deal of investment

User Southrop
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4 votes

Answer: at $194.6673, it is a good deal to invest

Step-by-step explanation:

From the statement made by the bank that investors should pay $100 per year for 10 years to get a return of $100 per year forever at an interest rate of 6%, we would need to calculate the Present net value to determine if this is a good deal.

Present net value = Present value of Perpetuity - Present value of Annuity

let us solve for each;

⇒ Present value of annuity in year 0

Present value = payment made × [(1- 1/(1+interest rate)yrs) / interest rate]

= $100 × [(1- 1/(1+6%)¹⁰) / 6%]

= $100 × [(1- 1/(1.06)¹⁰) / 0.06] = $100 ˣ 7.360087

Present value of annuity₀ = $736.0087

⇒ Value of Perpetuity in year 10

Present value of Perpetuity₁₀ = Amount / Rate

= $100/6% = $100/0.06 = $1666.7

Present value of Perpetuity₁₀ = $1666.7

⇒ Present value of perpetuity in year 0

Present value of Perpetuity₀ = Value of Perpetuity in the end of year 10 / (1 + Rate)ⁿ

where n = no of years

= $1666.7 /(1 + 6%)¹⁰ = $930.676

Present value of Perpetuity₀ = $930.676

Therefore the Net Present value = Present value of perpetuity(inflow) - Present value of annuity(outflow)

Therefore the Net Present value = $930.676 - $736.0087 = $194.6673

⇒This means that the net present value of the investment is a positive value i.e. $194.6673, so it is a good deal of investment.

cheers i hope this helps.

User Mythica
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