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7600 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 16000 dollars?
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76007600 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 1600016000 dollars?\newlineAnswer:

Full solution

Q. 76007600 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 1600016000 dollars?\newlineAnswer:
  1. Identify Formula: Identify the formula to use for compound interest.\newlineThe formula for compound interest is A=P(1+r/n)(nt)A = P(1 + 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.\newlineSince the problem does not specify how often the interest is compounded, we will assume it is compounded annually, so n=1n = 1.
  2. Set Up Equation: Set up the equation with the given values and solve for tt. We have P=$7600P = \$7600, A=$16000A = \$16000, r=6.25%r = 6.25\% or 0.06250.0625, and n=1n = 1. The equation becomes $16000=$7600(1+0.0625/1)(1t)\$16000 = \$7600(1 + 0.0625/1)^{(1\cdot t)}.
  3. Simplify and Isolate: Simplify the equation and isolate the exponential part.\newline16000=7600(1+0.0625)t16000 = 7600(1 + 0.0625)^{t}\newline16000=7600(1.0625)t16000 = 7600(1.0625)^{t}\newlineTo isolate tt, we need to divide both sides by 76007600.\newline160007600=(1.0625)t\frac{16000}{7600} = (1.0625)^{t}
  4. Calculate Left Side: Calculate the left side of the equation.\newline$16000/$7600=2.10526315789\$16000 / \$7600 = 2.10526315789 (approximately)\newlineSo, 2.10526315789=(1.0625)t2.10526315789 = (1.0625)^{t}
  5. Take Natural Logarithm: Take the natural logarithm of both sides to solve for tt.ln(2.10526315789)=ln((1.0625)t)\ln(2.10526315789) = \ln((1.0625)^{t})Use the property of logarithms that ln(ab)=bln(a)\ln(a^b) = b\cdot\ln(a).ln(2.10526315789)=tln(1.0625)\ln(2.10526315789) = t \cdot \ln(1.0625)
  6. Calculate Logarithm: Calculate the natural logarithm of both sides.\newlineln(2.10526315789)0.7447274949\ln(2.10526315789) \approx 0.7447274949\newlineln(1.0625)0.06062462182\ln(1.0625) \approx 0.06062462182\newlineNow, divide the logarithm of the left side by the logarithm of the right side to find tt.\newlinet=ln(2.10526315789)ln(1.0625)t = \frac{\ln(2.10526315789)}{\ln(1.0625)}\newlinet0.74472749490.06062462182t \approx \frac{0.7447274949}{0.06062462182}
  7. Calculate Value: Calculate the value of tt.t0.74472749490.06062462182t \approx \frac{0.7447274949}{0.06062462182}t12.28t \approx 12.28Since we need to find the nearest year, we round tt to the nearest whole number.t12t \approx 12 years

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