Determine the difference in annual worth between an investment of $100,000 per year for 50 years and an investment of $100,000 per year forever at an interest rate of (a) 5% and (b) 10% per year. Compare the two differences.

What will be an ideal response?


(a) AW50 = 100,000(A/P,5%,50)
= 100,000(0.05478)
= $5478

AW? = Pi = 100,000(0.05)
= $5,000

Difference is $478

(b) AW50 = 100,000(A/P,10%,50)
= 100,000(0.10086)
= $10,086

AW? = Pi = 100,000(0.10)
= $10,000

Difference is $86, a lot smaller than at 5% per year

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