Aunt Li bought a one-year bond of a company with 25,000 yuan, and deducted 20% interest tax for one year, and the sum of principal and interest was 26,000 yuan. What is the annual interest rate of this bond?

3. You need to print a document. It takes 6 hours for Xiao Li to complete it independently, and 8 hours for Xiao Wang to complete it independently. How long will it take if they do it together?

4. In the calendar of 65438+2003 10 as shown in the figure, circle any 3×3 number with a rectangular box.

Sunday Monday Tuesday Wednesday Thursday Friday Saturday

1 2 3 4

5 6 7 8 9 10 1 1

12 13 14 15 16 17 18

19 20 2 1 22 23 24 25

26 27 28 29 30 3 1

(1) If the sum of three numbers on the diagonal from the lower left corner to the upper right corner is 45, then the sum of these nine numbers is

Of these nine dates, the last day is the fourth day;

(2) In this month's calendar, can you circle 9 numbers "The total is 162"? If yes, what are these 9 dates? If not, please guess if you can circle it in next month's calendar, and guess when the last day of the circled 9 numbers is.