Part A. How long will it take for an investment of $6,000 to double if the investment earns interest at the rate of 5%/year compounded continuously? (Round your answer to one decimal place.)
Part B. Find the interest rate needed for an investment of $3,000 to grow to $7,000 in 3 years if interest is compounded continuously. (Round your answer to the nearest hundredth of a percentage point.)