A principal of $4100 is invested at 5.75% interest, compounded annually. How many years will it take to accumulate $6000 or more in the account? (Use the calculator provided if necessary.)Write the smallest possible whole number answer.years
Question
A principal of 6000 or more in the account? (Use the calculator provided if necessary.)Write the smallest possible whole number answer.years
Solution
To solve this problem, we can use the formula for compound interest, which is A = P(1 + r/n)^(nt), where:
- A is the amount of money accumulated after n years, including interest.
- P is the principal amount (the initial amount of money).
- r is the annual interest rate (in decimal form).
- n is the number of times that interest is compounded per year.
- t is the time the money is invested for in years.
In this case, we are trying to solve for t (time), the formula becomes t = log(A/P) / n * log(1 + r/n).
Given:
- P = $4100
- r = 5.75% = 0.0575 (in decimal form)
- A = $6000
- n = 1 (since the interest is compounded annually)
Substituting these values into the formula, we get:
t = log(6000/4100) / 1 * log(1 + 0.0575)
Using a calculator to solve this equation, we get t ≈ 7.27 years.
Since the problem asks for the smallest possible whole number of years, we need to round up (since we can't have a fraction of a year). So, it will take 8 years for the account to accumulate $6000 or more.
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