Atlas V 500 Rocket. 1  Function: Space lift vehicle. 2  Height: 62.5 meters (205 feet) tall. 3  Diameter: 3.81 meters (12.5 feet) 4  Mass: 21,173 kilograms (46,678 pounds) 5  Stages: Two. 6  Maiden Flight: Aug. 21, 2002.
Electronic Series EE Savings Bonds are purchased at face value. For example: A face-value $100 electronic EE bond is purchased for $100. The minimum purchase of an electronic EE Savings Bond is $25; The maximum purchase of electronic EE Savings Bonds annually, per calendar year, is $10,000. Maturity Rules for Series EE Savings Bonds Current Interest Rate for EE Bonds purchased Nov 1, 2017 to Apr 30, 2018: 0.10%. History of the EE Savings Bond.  were originally offered on July 1, 1980, to replace Series E Savings Bonds, which were withdrawn from sale.
The current rate is 3% so 72/3 means it will take about 24 years to double or reach face value. The interest paid in the past was variable (I have those bonds). All EE savings bonds be it paper or non-paper will earn interest for 30 years. Therefore, you must cash your bonds at 30 years.