How much would [tex]$1, growing at 3.5\%$[/tex] per year, be worth after 75 years?

A. [tex]$12.54$[/tex]
B. [tex]$13.20$[/tex]
C. [tex]$13.86$[/tex]
D. [tex]$14.55$[/tex]
E. [tex]$15.28$[/tex]



Answer :

To determine the value of [tex]\(\$1\)[/tex] growing at an annual growth rate of 3.5% over 75 years, we use the formula for compound interest. The compound interest formula is given by:

[tex]\[ A = P \left(1 + \frac{r}{n}\right)^{nt} \][/tex]

where:
- [tex]\(A\)[/tex] is the amount of money accumulated after [tex]\(n\)[/tex] years, including interest.
- [tex]\(P\)[/tex] is the principal amount (\[tex]$1 in this case). - \(r\) is the annual interest rate (3.5% or 0.035 as a decimal). - \(n\) is the number of times interest is compounded per year (since it's compounded annually, \(n = 1\)). - \(t\) is the number of years the money is invested or borrowed for (75 years). Plugging the given values into the formula, we get: \[ A = 1 \left(1 + \frac{0.035}{1}\right)^{1 \times 75} \] Simplifying inside the parenthesis first: \[ A = 1 \left(1 + 0.035\right)^{75} \] \[ A = 1 \left(1.035\right)^{75} \] Calculating \(1.035^{75}\): This results in approximately \(13.19855\). So, \(\$[/tex]1\) growing at an annual rate of 3.5% over 75 years would be worth approximately [tex]\( \$13.20\)[/tex].

From the given choices, the closest value is:

[tex]\[ \boxed{13.20} \][/tex]