1. A bond has matured after 25 years and it is now worth $26,000. At an annual rate of return of 3%, what is the bond's face value?

2. A one year note has a face value of $25,000 and it is discounted at 10%. The note pays 5% interest per year. If sold, what is the rate of return?

3. Calculate the simple interest on $3,720 at 5.5% for one year and four months.

4. Find the interest on $8,000 at 10% compounded semiannually for 4 years.