2 = (1+i)20
Solving for i,
i = 21/20 – 1 = 0.0353 or 3.53%
In this example, the Rule of 72, provides a good approximation.
The other good offer from the US Treasury is the purchase of I bonds. These bonds have an interest rate that is inflation adjusted every six months. Since the United States has recently experienced a period of higher-than-normal inflation, the interest rate being offered through April 2022 is 7.12%. Next spring, the rate will be adjusted again. I know of no other low-risk investments with 7%+ returns. Investors can buy $10,000 per calendar year.
Update 5/2/2022 - The treasury announced the I bond rate for the next six months will be 9.62%: Individual - Buying Series I Savings Bonds (treasurydirect.gov)
For information on the rates, Go to: https://www.treasurydirect.gov/indiv/research/indepth/ibonds/res_ibonds.htm#irate
The interest rate was recently adjusted earlier this week and is adjusted, based on inflation, every 6 months (each May and November).
Each person can buy up to $15,000 each year:
Electronic: $10,000, total, each calendar year
Paper: $5,000, total, each calendar year
If you don't have an account already, set one up here: https://www.treasurydirect.gov/RS/UN-AccountCreate.do
Once you have account, you can buy the I-bonds online from Treasury Direct. Next year, you can also buy a paper I bond using your tax refund.
I bonds earn interest for 30 years unless you cash them first. You can cash them after one year. But if you cash them before five years, you lose the previous three months of interest. (For example, if you cash an I bond after 18 months, you get the first 15 months of interest.)
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