Types Of Government Bonds Government Savings Bonds Help Please?

Government savings bonds help please? - types of government bonds

Can someone help me help you with some quick strategies for the Observatory. What type of series (normal) is there and what the exchange rate. Are guaranteed. I do not know much, but I have something like a series EA has an interest rate of 5 years. Does this mean that it doubles in 5 years (you buy a thousand-dollar bonus to get $ 500 and $ 1000 in 5 years?) Can he change in price due to the economy or is fixed, and that's it? Someone can only basis hlpe thanx, how long does it take to get the number has doubled, and may be affected by the economy? Anything else would be very grateful.