Question 4 (2 points) An account is opened with an initial deposit of \( \$ 2,400 \) and earns \( 3.9 \% \) interest compounded monthly. What will the account be worth in 21 years? (round to 2 decimal places) Your Answer:

[-/1 Points] DETAILS MY NOTES SCOLALG7 4.5.091. Find the time required for an investment of \( \$ 3000 \) to grow to \( \$ 8000 \) at an interest rate of \( 7.5 \% \) per year, compounded quarterly. (Round your answer to two decimal places.) Need Help? Readli Wateh it

3. Georgeanna wants to buy a copier for the office. The copier costs \( \$ 599 \). She can pay for it all at once, ar she can make monthly payments. She makes monthly payments. She puts \( \$ 100 \) down, and pays \( \$ 25 \) a month for 24 months. Which way of paying costs more? By how much? Answer: The difference is \( \$ \)

Suppose that \( \$ 17,000 \) is invested at continuous rate r and grows to \( \$ 81,103 \) in 28 years. Find the interest rate r. The interest rate is \( \square \% \). (Round to the nearest percent as needed.)

Brett sells farm equipment. He earns a base salary of \( \$ 21,000 \) per year. He also earns a commission of \( 6 \% \) on all sales that he makes. This year he sells \( \$ 260,000 \) of equipment. What is his total salary, including commission? Write an expression and find the answer. Iswer:

Suppose that \( \$ 17,000 \) is invested at continuous rate \( r \) and grows to \( \$ 81,103 \) in 28 years. Find the interest rate \( r \). The interest rate is \( \% \). (Round to the nearest percent as needed.)