You invest $5,000 in a savings account that offers an annual interest rate of 6%, compounded annually. How long will it take for your investment to grow to $8,000? Use the formula A=P(1+nr)nt, where A is the balance (final amount), P is the principal (starting amount), r is the interest rate expressed as a decimal, n is the number of times per year that the interest is compounded, and t is the time in years. Round your answer to the nearest hundredth.
Q. You invest $5,000 in a savings account that offers an annual interest rate of 6%, compounded annually. How long will it take for your investment to grow to $8,000? Use the formula A=P(1+nr)nt, where A is the balance (final amount), P is the principal (starting amount), r is the interest rate expressed as a decimal, n is the number of times per year that the interest is compounded, and t is the time in years. Round your answer to the nearest hundredth.
Identify values: Identify the values of P, r, n, and A. P=$5,000A=$8,000r=0.06n=1
Use formula and solve: Use the formula A=P(1+nr)nt and solve for t. 8,000=5,000(1+10.06)1⋅t8,000=5,000(1.06)t
Divide to isolate term: Divide both sides by 5,000 to isolate the exponential term. 5,0008,000=(1.06)t1.6=(1.06)t
Take natural logarithm: Take the natural logarithm (ln) of both sides to solve for t. ln(1.6)=ln((1.06)t)ln(1.6)=t⋅ln(1.06)
Divide to isolate t: Divide both sides by ln(1.06) to isolate t. t=ln(1.06)ln(1.6)
Calculate value of t: Calculate the value of t. t=ln(1.6)/ln(1.06)t≈0.470/0.058t≈8.10
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