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Anton [14]
3 years ago
9

Find the required annual interest rate, to the nearest tenth of a percent, for $ 1170 to grow to $ 1708

Mathematics
1 answer:
Talja [164]3 years ago
6 0

Answer:

Step-by-step explanation:

The formula you need for this is

A(t)=P(1+\frac{r}{n})^{nt}

where A(t) is the final amount after the compounding is done, P is the initial investment, r is the interest rate in decimal form, n is the number of times per year that the money is compounded, and t is the time in years. Filling in accordingly:

1708=1170(1+\frac{r}{4})^{(4)(6)}

First things first. Simplify by division and then multiply the n by the t to get the exponent:

Divide 1708 by 1170 to get the equation:

1.45982906=(1+\frac{r}{4})^{24}

Undo the 24th power by taking the 24th root of both sides to get:

1.015888202=1+\frac{r}{4} Now subtract 1 from both sides to get

.0158882024=\frac{r}{4} Multiply both sides by 4 to finish it off and get that

r = .0635528 but since we want the percentage, we move the decimal 2 places to the right and round to r = 6.4% which is choice A.

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