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Josiah invests [tex]\$360[/tex] into an account that accrues [tex]3\%[/tex] interest annually. Assuming no deposits are made, which equation represents the amount of money in Josiah's account, [tex]y[/tex], after [tex]x[/tex] years?

A. [tex]y = 360(1.3)^x[/tex]
B. [tex]y = 360(0.3)^x[/tex]
C. [tex]y = 360(0.03)^x[/tex]
D. [tex]y = 360(1.03)^x[/tex]

Answer :

To solve this problem, follow these steps:

1. Josiah initially invests \$360.
2. The account earns an annual interest rate of 3%. This means that after one year, the account balance is increased by 3% of the balance at the beginning of the year.
3. An increase of 3% is equivalent to multiplying the original amount by the factor
$$1 + 0.03 = 1.03.$$
4. Since the interest is compounded annually, the amount after $x$ years is given by the compound interest formula:
$$y = 360(1.03)^x.$$
5. Among the provided choices, the correct equation is:
$$y = 360(1.03)^x.$$

Thus, the correct answer is the fourth option.

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