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A person places 
$8230 in an investment account earning an annual rate of 
4.1%, 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 15 years.
Answer:

A person places $8230 \$ 8230 in an investment account earning an annual rate of 4.1% 4.1 \% , compounded continuously. Using the formula V=Pert V=P e^{r t} , where V \mathrm{V} is the value of the account in t 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 1515 years.\newlineAnswer:

Full solution

Q. A person places $8230 \$ 8230 in an investment account earning an annual rate of 4.1% 4.1 \% , compounded continuously. Using the formula V=Pert V=P e^{r t} , where V \mathrm{V} is the value of the account in t 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 1515 years.\newlineAnswer:
  1. Identify Given Values: Identify the given values from the problem.\newlinePrincipal PP = $8230\$8230\newlineRate rr = 4.1%4.1\% or 0.0410.041 (as a decimal)\newlineTime tt = 1515 years\newlineWe will use the formula V=PertV = Pe^{rt} to find the value VV of the account after 1515 years.
  2. Convert Rate to Decimal: Convert the percentage rate to a decimal.\newlineTo convert a percentage to a decimal, divide by 100100.\newliner=4.1%=4.1100=0.041r = 4.1\% = \frac{4.1}{100} = 0.041
  3. Substitute Values into Formula: Substitute the values into the formula.\newlineUsing the formula V=PertV = Pe^{rt}, we substitute P=$8230P = \$8230, r=0.041r = 0.041, and t=15t = 15.\newlineV=8230×e0.041×15V = 8230 \times e^{0.041 \times 15}
  4. Calculate Exponent: Calculate the exponent part of the formula.\newlinert=0.041×15=0.615rt = 0.041 \times 15 = 0.615\newlineNow we have V=8230×e0.615V = 8230 \times e^{0.615}
  5. Calculate e Value: Calculate the value of ee raised to the power of 0.6150.615. Using a calculator, we find e0.6151.84986e^{0.615} \approx 1.84986.
  6. Multiply Principal by e Value: Multiply the principal by the value of ee raised to the power of rtrt. \newlineV=8230×1.8498615217.14V = 8230 \times 1.84986 \approx 15217.14
  7. Round to Nearest Cent: Round the result to the nearest cent.\newlineThe value of the investment account after 1515 years, rounded to the nearest cent, is approximately $15217.14\$15217.14.

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