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A new car is purchased for 22300 dollars. The value of the car depreciates at 
12.25% per year. To the nearest tenth of a year, how long will it be until the value of the car is 3700 dollars?
Answer:

A new car is purchased for 2230022300 dollars. The value of the car depreciates at 12.25% 12.25 \% per year. To the nearest tenth of a year, how long will it be until the value of the car is 37003700 dollars?\newlineAnswer:

Full solution

Q. A new car is purchased for 2230022300 dollars. The value of the car depreciates at 12.25% 12.25 \% per year. To the nearest tenth of a year, how long will it be until the value of the car is 37003700 dollars?\newlineAnswer:
  1. Determine type of depreciation: Determine the type of depreciation. The car depreciates at a constant percentage each year. This is an example of exponential decay.
  2. Identify values: Identify the initial value aa, the rate of depreciation rr, and the final value P(t)P(t).
    Initial value, a=$22,300a = \$22,300
    Rate of depreciation, r=12.25%r = 12.25\% or 0.12250.1225 in decimal form
    Final value, P(t)=$3,700P(t) = \$3,700
  3. Set up formula: Set up the exponential decay formula.\newlineThe formula for exponential decay is P(t)=a×(1r)tP(t) = a \times (1 - r)^t, where P(t)P(t) is the value after time tt, aa is the initial amount, and rr is the rate of decay.
  4. Substitute values: Substitute the known values into the formula.\newline$3,700=$22,300×(10.1225)t\$3,700 = \$22,300 \times (1 - 0.1225)^t
  5. Solve for t: Solve for t.\newlineFirst, divide both sides by $22,300\$22,300 to isolate the exponential expression.\newline(10.1225)t=$3,700$22,300(1 - 0.1225)^t = \frac{\$3,700}{\$22,300}
  6. Calculate division: Calculate the division on the right side of the equation.\newline(10.1225)t=0.1659192825(1 - 0.1225)^t = 0.1659192825
  7. Take natural logarithm: Take the natural logarithm of both sides to solve for tt.ln((10.1225)t)=ln(0.1659192825)\ln((1 - 0.1225)^t) = \ln(0.1659192825)tln(10.1225)=ln(0.1659192825)t \cdot \ln(1 - 0.1225) = \ln(0.1659192825)
  8. Calculate logarithms: Calculate the natural logarithms.\newlinetln(0.8775)=ln(0.1659192825)t \cdot \ln(0.8775) = \ln(0.1659192825)\newlinet(0.132289)=1.797t \cdot (-0.132289) = -1.797
  9. Solve for t: Solve for t by dividing both sides by ln(0.8775)\ln(0.8775).t=1.7970.132289t = \frac{-1.797}{-0.132289}
  10. Calculate division: Calculate the division to find the value of tt.t13.584t \approx 13.584
  11. Round to nearest tenth: Round tt to the nearest tenth of a year.\newlinet13.6t \approx 13.6 years

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