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write an exponential function to model the situation. find the amount after the specified time. $1,000 principal, 3.6% compounded monthly for 10 years

Sagot :

We can model this problem by an exponential growth:

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

where A is the amount accumulated, P is the principal, r is the interest rate, n is the number of times per year and t is the time. By substituting our given data, we get

[tex]\begin{gathered} A=1000(1+\frac{0.036}{12})^{12t} \\ A=1000(1+0.003)^{12t} \end{gathered}[/tex]

therefore, the model is

[tex]A=1000(1.003)^{12t}[/tex]

Now, by substituting t=10 years, we have

[tex]A=1000(1.003)^{120}[/tex]

then, the amount will be

[tex]A=1432.55\text{ dollars}[/tex]