A) Find the interest rate needed for an investment of $8,000 to double in 14 yr if interest is compounded monthly.

B)How long will it take for an investment of $10,000 to grow to $12,500 if the investment earns interest at the rate of 8%/year compounded annually?

C)How long will it take for an investment of $15,000 to double if the investment earns interest at the rate of 7%/year compounded continuously?