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You invest $5,000\$5,000 in a savings account that offers an annual interest rate of 6%6\%, compounded annually. How long will it take for your investment to grow to $8,000\$8,000? Use the formula A=P(1+rn)ntA = P\left(1 + \frac{r}{n}\right)^{nt}, where AA is the balance (final amount), PP is the principal (starting amount), rr is the interest rate expressed as a decimal, nn is the number of times per year that the interest is compounded, and tt is the time in years. Round your answer to the nearest hundredth.

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Q. You invest $5,000\$5,000 in a savings account that offers an annual interest rate of 6%6\%, compounded annually. How long will it take for your investment to grow to $8,000\$8,000? Use the formula A=P(1+rn)ntA = P\left(1 + \frac{r}{n}\right)^{nt}, where AA is the balance (final amount), PP is the principal (starting amount), rr is the interest rate expressed as a decimal, nn is the number of times per year that the interest is compounded, and tt is the time in years. Round your answer to the nearest hundredth.
  1. Identify values: Identify the values of PP, rr, nn, and AA. P=$5,000P = \$5,000 A=$8,000A = \$8,000 r=0.06r = 0.06 n=1n = 1
  2. Use formula and solve: Use the formula A=P(1+rn)ntA = P\left(1 + \frac{r}{n}\right)^{nt} and solve for tt. 8,000=5,000(1+0.061)1t8{,}000 = 5{,}000\left(1 + \frac{0.06}{1}\right)^{1 \cdot t} 8,000=5,000(1.06)t8{,}000 = 5{,}000(1.06)^t
  3. Divide to isolate term: Divide both sides by 5,0005,000 to isolate the exponential term. 8,0005,000=(1.06)t\frac{8,000}{5,000} = (1.06)^t 1.6=(1.06)t1.6 = (1.06)^t
  4. Take natural logarithm: Take the natural logarithm (ln\ln) of both sides to solve for tt. ln(1.6)=ln((1.06)t)\ln(1.6) = \ln((1.06)^t) ln(1.6)=tln(1.06)\ln(1.6) = t \cdot \ln(1.06)
  5. Divide to isolate t: Divide both sides by ln(1.06) \ln(1.06) to isolate t t . t=ln(1.6)ln(1.06) t = \frac{\ln(1.6)}{\ln(1.06)}
  6. Calculate value of t: Calculate the value of tt. t=ln(1.6)/ln(1.06)t = \ln(1.6) / \ln(1.06) t0.470/0.058t \approx 0.470 / 0.058 t8.10t \approx 8.10

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