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Five mathematical problems about the use of numbers practical problem 1. Chen Lin deposits 6000 yuan in the bank for one year with an annual interest rate of 4.14%. How much is the total amount of principal and after tax interest due? (interest tax is calculated at 5%) 2. For a book, Xiao Hong read 25% of the whole book on the first day, 18 pages on the second day, and 66 pages left. How many pages are there in this book? 3. The school bought a total of 80 basketball and ball, the number of basketball is 60% of the ball? 4. (1) there were 2500 classes of planting trees in a forest farm last year and 1900 classes of planting trees this year. How many percent less than last year? (2) There were 2500 classes for tree planting in a forest farm last year. The number of trees planted this year is 24% less than that of last year. How many classes are there for tree planting this year? (3) There were 2500 classes of tree planting in a forest farm last year, which was 24% less than last year. How many classes of tree planting last year? 5. A steel pipe used 1 / 4 of it for the first time, and 1 / 3 of it for the second time. Two times, it just used half of the steel pipe. How many meters of the steel pipe used to be
1. After one year, the total principal and interest is 6000 × (1 + 4.14%) = 6248.4, the interest tax is (6248.4-6000) × 5% = 12.426248.4-12.42 = 6235.98, and the principal and after tax interest are 6235.98 yuan
A mathematical problem of number
The unit price of rice in April and may is a yuan and B yuan. Party A and Party B bought rice in April and may. Party A bought 100kg each time, and Party B bought 100 yuan each time. Calculate the average unit price of two times
A (a + b) / 2,
B is 200 / (100 / A + 100 / b) = 2Ab / (a + b)
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