The U.S. government announced today (Apr. 1, 2014) that they will start paying off the U.S. national debt. This will be treated as a mortgage loan with equal daily payments (except possibly the last payment which may be smaller). The principal will be taken as: $17,564,323,934,988.67 and the daily interest rate will be taken as an annual rate of 3.25% but scaled to a daily interest rate using the Gregorian calendar, (3.25% * 400/(400*365+100-3) ) rounded to 8 significant decimal digits. The equal daily payments (except for the last one) are minimal. The first payment is mostly interest except for a principal reduction (when rounded) of only one cent. The interest is computed by the actuarial method, compounded daily, based on the above daily interest rate. The first payment will be made on Apr. 2, 2014. Math questions based on the above: 1. What is the daily interest rate rounded to 8 significant digits? 2. What is the amount of the fixed daily payments? 3. When is the first day when the principal reduction rounds to 2 cents? 4. How many daily payments are made? 5. When is the loan payed off? (year month day) 6. How much was the last payment? 7. How much of the last payment was principal reduction? 8. What is the total amount of all the above payments? 9. What is total amount of all the interest?