How much do you need to invest in an account earning an annual interest rate of \( 4.057 \% \) compounded daily, so hat your money will grow to \( \$ 6,494.00 \) in 31 days? Principal: Note: Your answers should include a dollar sign and be accurate to two decimal places)
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To find out how much you need to invest (the principal), you can use the formula for compound interest: \[ A = P \left(1 + \frac{r}{n}\right)^{nt} \] 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 (decimal). - \( n \) is the number of times that interest is compounded per year. - \( t \) is the time the money is invested for in years. In your case: - \( A = 6494 \) - \( r = 0.04057 \) - \( n = 365 \) (daily compounding) - \( t = \frac{31}{365} \) years Now rearranging the formula to solve for \( P \): \[ P = \frac{A}{\left(1 + \frac{r}{n}\right)^{nt}} \] Substituting the values into the equation gives: \[ P = \frac{6494}{\left(1 + \frac{0.04057}{365}\right)^{365 \times \frac{31}{365}}} \] Calculating that: \[ P = \frac{6494}{\left(1 + 0.0001112\right)^{31}} \approx \frac{6494}{1.003916} \] \[ P \approx 6460.45 \] So, the principal amount you need to invest is approximately: **Principal: $6,460.45**
