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5800 dollars is placed in an account with an annual interest rate of 
6.25%. To the nearest year, how long will it take for the account value to reach 27500 dollars?
Answer:

58005800 dollars is placed in an account with an annual interest rate of 6.25% 6.25 \% . To the nearest year, how long will it take for the account value to reach 2750027500 dollars?\newlineAnswer:

Full solution

Q. 58005800 dollars is placed in an account with an annual interest rate of 6.25% 6.25 \% . To the nearest year, how long will it take for the account value to reach 2750027500 dollars?\newlineAnswer:
  1. Identify type of interest: Identify the type of interest being applied.\newlineSince the problem does not specify compound or simple interest, we will assume compound interest is being applied, which is common for savings accounts.
  2. Determine compound interest formula: Determine the formula to use for compound interest.\newlineThe compound interest formula is A=P(1+rn)ntA = P(1 + \frac{r}{n})^{nt}, where:\newlineAA = the amount of money accumulated after nn years, including interest.\newlinePP = the principal amount (the initial amount of money).\newlinerr = the annual interest rate (decimal).\newlinenn = the number of times that interest is compounded per year.\newlinett = the time the money is invested for, in years.
  3. Convert rate to decimal: Convert the annual interest rate from a percentage to a decimal. 6.25%6.25\% as a decimal is 0.06250.0625.
  4. Assume annual compounding: Assume that the interest is compounded once per year n=1n=1 for simplicity, as the problem does not specify.
  5. Set up and solve equation: Set up the equation with the given values and solve for tt.A=27500A = 27500, P=5800P = 5800, r=0.0625r = 0.0625, n=1n = 1.27500=5800(1+0.0625/1)(1t)27500 = 5800(1 + 0.0625/1)^{(1\cdot t)}
  6. Simplify and solve for tt: Simplify the equation and solve for tt.27500=5800(1+0.0625)t27500 = 5800(1 + 0.0625)^t275005800=(1.0625)t\frac{27500}{5800} = (1.0625)^t4.74137931034(1.0625)t4.74137931034 \approx (1.0625)^t
  7. Use logarithms to solve: Use logariths to solve for tt.\newlineTake the natural logarithm (ln\ln) of both sides to get:\newlineln(4.74137931034)t×ln(1.0625)\ln(4.74137931034) \approx t \times \ln(1.0625)
  8. Calculate natural logarithm: Calculate the natural logarithm of both sides.\newlineln(4.74137931034)t×ln(1.0625)\ln(4.74137931034) \approx t \times \ln(1.0625)\newlinetln(4.74137931034)ln(1.0625)t \approx \frac{\ln(4.74137931034)}{\ln(1.0625)}
  9. Perform calculations: Perform the calculations.\newlinetln(4.74137931034)ln(1.0625)t \approx \frac{\ln(4.74137931034)}{\ln(1.0625)}\newlinet1.556037620150.060624621t \approx \frac{1.55603762015}{0.060624621}\newlinet25.6666666667t \approx 25.6666666667
  10. Round result to nearest year: Round the result to the nearest year. t26t \approx 26 years

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