In order to meet the "11" golden week, all commodities are sold at a price of 15 yuan. A coat is sold at 640 yuan after the price reduction. How much is the original price of this coat?

A: the original price of this coat is 800 yuan

The price of a schoolbag has been reduced by 10% twice in a row. The price is 40.5 yuan. How much is the original price? What is the formula?

40.5/0.9/0.9=50

A commodity has been reduced by 15% twice in a row. Is the second reduction smaller than the first?

Of course, for example, for an item, the first drop of 100 yuan is 15%, 100 times 0.15 equals 15, the first drop is 15 yuan, 100 yuan minus the reduced 15 yuan, the remaining 85 yuan is 85 yuan, and then 15% 85 times 0.15 equals 12.75 yuan, the second drop is 12.75 yuan, which is 2.25 yuan less than the first drop
Although my answer is tedious, my ultimate goal is to understand it

The original price of an article is a yuan. After two successive price cuts of one tenth, how much is the current price?
There are three more
The original price of an article is a yuan. After two consecutive price increases of one tenth, how much is the current price?
The original price of an article is a yuan. First, the price is increased by one tenth, then the price is reduced by one tenth. How much is the current price?
An article's original price is a yuan, then it's reduced by one tenth, then it's increased by one tenth. How much is the current price?

1 a*(1+10%)*(1+10%)
2 (a*(1+10%))*(1-10%)
3 (a*(1-10%))*(1+10%)

4.16.37.58.89.145?

4 can be regarded as 0 4
Square of 0 + square of 4 = 16 take out the 1 of ten bits and the 6 of each bit
Square of 1 + square of 6 = 37, take out the 3 of 10 and the 7 of each bit
Square of 3 + square of 7 = 58, take out 5 of 10 and 8 of each
Square of 5 + square of 8 = 89, take out 8 of 10 and 9 of each
Square of 8 + square of 9 = 145

My teacher's composition is about 250 words
You're all late. You finished your homework early

"Dang, Dang, Dang" the new year's bell rings, and red or golden couplets have been pasted on the doors of every family. All the old and young of every family are too happy to close their mouths. Some excited children are staring at the TV, enjoying the annual party dinner, the Spring Festival Gala; some are eager to pay New Year's greetings to their elders, send text messages and make phone calls, All the new year's blessings seem to be endless; naughty children are "asking" their parents for new year's money; the sound of firecrackers outside the house keeps popping, and the colorful fireworks make this special night more colorful
On the first day of the first month of the lunar new year, the first day of the Lunar New Year is full of joy and peace. As a lazy man, I get up early today, because I want to put on my beautiful new clothes and go out to show off. I'm going to visit my relatives and friends to celebrate the new year, which is undoubtedly a happy thing. We children walk in front of the new year's team and see our elders, Say a few lucky words, you can harvest a lot of lucky money, and then take it to the street to buy your favorite things - toys, snacks, firecrackers The parents seem to have changed their personality. They are so tolerant of our indulgence. They have everything! This is the feeling of Chinese New Year
"Let off firecrackers!" I don't know who yelled, and the children soon gathered together. A string of firecrackers lit in people's hands, making a loud noise, splashing everywhere, as if to send a good wish to thousands of families. Bursts of firecrackers continued, lively
When it's time to eat, we children don't feel hungry at all when we look at the table full of our favorite dishes. When adults push cups and change cups, they mostly talk about: today is not what it used to be! Today's happy life can best explain the problem from the table. Now people's life is better, and every day is like a new year!
On the way to visit relatives and friends, I saw the fields full of spring. The newly built expressways shortened our journey. The mud roads leading to the countryside were also covered by the cement roads of "village to village". The high-rise buildings in the city were springing up, changing year by year

4.16.37.58.89.145
Figure out and explain why

Starting from the second number, each number is the sum of squares of each bit of the previous number
16=0^2+4^2
37=1^2+6^2
58=3^2+7^2
…………

Praise the teacher's composition below 400 words!

This is you --- a glorious teacher of the people! As a teacher of the people, you have nothing to ask for, just want to impart knowledge to lovely students, you have nothing to love, just want to put all your body and mind into your heart

4,16,37,58,89,( ),( ),( ),4,16,37

58.37.16

According to the relevant regulations of the state, 14% of the personal income tax should be paid for the part above 800 yuan
How much is the contribution fee?

1200-800 = 400 yuan, 400x14% = 56 yuan, 1200-56 = 1144 yuan a: the actual contribution fee is 1144 yuan

In order to meet the "11" golden week, all commodities are sold at a price of 15 yuan. A coat is sold at 640 yuan after the price reduction. How much is the original price of this coat?