On December 28, 2007, you could buy a 10-year U.S. Treasury note for $10000 that pays 6.29% simple interest every year through December 28, 2017. How much total interest would it earn by then?

To calculate the total interest earned on a 10-year U.S. Treasury note, you need to multiply the initial investment by the interest rate and the number of years.

In this case, the initial investment is $10,000, the interest rate is 6.29%, and the investment period is 10 years.

To calculate the total interest, you can use the formula:
Total Interest = Initial Investment * Interest Rate * Investment Period

To convert the percentage interest rate to a decimal, divide it by 100: 6.29/100 = 0.0629.

Now, you can calculate the total interest:

Total Interest = $10,000 * 0.0629 * 10 = $6,290

Therefore, the total interest earned on the 10-year U.S. Treasury note by December 28, 2017, would be $6,290.