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A person places 
$6520 in an investment account earning an annual rate of 
7.7%, compounded continuously. Using the formula 
V=Pe^(rt), where 
V is the value of the account in t years, 
P is the principal initially invested, 
e is the base of a natural logarithm, and 
r is the rate of interest, determine the amount of money, to the nearest cent, in the account after 14 years.
Answer:

A person places $6520 \$ 6520 in an investment account earning an annual rate of 7.7% 7.7 \% , compounded continuously. Using the formula V=Pert V=P e^{r t} , where V \mathrm{V} is the value of the account in t years, P \mathrm{P} is the principal initially invested, e \mathrm{e} is the base of a natural logarithm, and r r is the rate of interest, determine the amount of money, to the nearest cent, in the account after 1414 years.\newlineAnswer:

Full solution

Q. A person places $6520 \$ 6520 in an investment account earning an annual rate of 7.7% 7.7 \% , compounded continuously. Using the formula V=Pert V=P e^{r t} , where V \mathrm{V} is the value of the account in t years, P \mathrm{P} is the principal initially invested, e \mathrm{e} is the base of a natural logarithm, and r r is the rate of interest, determine the amount of money, to the nearest cent, in the account after 1414 years.\newlineAnswer:
  1. Identify Values: Identify the given values from the problem.\newlinePrincipal PP = $6520\$6520\newlineRate of interest rr = 7.7%7.7\% or 0.0770.077 (as a decimal)\newlineTime tt = 1414 years\newlineWe will use the formula for continuous compounding: V=PertV = Pe^{rt}
  2. Convert Rate to Decimal: Convert the percentage rate to a decimal by dividing by 100100.r=7.7%=7.7100=0.077r = 7.7\% = \frac{7.7}{100} = 0.077
  3. Substitute into Formula: Substitute the values into the formula. V=6520×e0.077×14V = 6520 \times e^{0.077 \times 14}
  4. Calculate Exponent: Calculate the exponent part of the formula.\newline0.077×14=1.0780.077 \times 14 = 1.078
  5. Calculate eResulte^{\text{Result}}: Calculate ee raised to the power of the result from Step 44.\newlinee1.078e^{1.078} (Use a calculator for this step)
  6. Multiply by Principal: Multiply the principal by the result from Step 55.\newlineV=6520×e1.078V = 6520 \times e^{1.078}\newline(Using a calculator, e1.0782.940e^{1.078} \approx 2.940)\newlineV6520×2.940V \approx 6520 \times 2.940
  7. Perform Final Multiplication: Perform the multiplication to find the final value. V6520×2.94019168.80V \approx 6520 \times 2.940 \approx 19168.80

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