When a factory saved 5000kW. H in the first half of the year, hairdresser hair dryer: This is 500W, and the factory can save 10000 electric power. So hair dryer: what's wrong? When a reporter talked about the 5000kW. H power saving of a factory in the first half of the year, he held up a haircut hair dryer and said: This is 500W, that is, 0.5KW. This factory can save electricity and start 10000 hair dryers. What's wrong with this reporter?

KWh is the electric potential, 1kwh (kilowatt hour) is commonly known as 1 kilowatt hour; watt (W) is the unit of power, which refers to the amount of electricity consumed by electrical appliances in a unit time
It can be said that "this factory can save electricity and run 10000 hair dryers at the same time for one hour."

The original price of a kind of clothing is 85 yuan, but now it is 80 yuan. What's the decrease?

(85-80) △ 85 = 5 △ 85, ≈ 0.06, = 6%; a: reduced by 6%

The current price of a kind of clothing is 80 yuan, which is 5 yuan lower than the original price, which is several percent lower

5÷﹙80＋5﹚＝5.9％

With the rapid development of computer technology, the price of computer is constantly decreasing. The original price of a certain brand of computer is n yuan. Now, after the original price is reduced by M yuan, it is reduced by 10%. So the current price of the computer is______ Yuan

According to the title, the current price of the computer is: (n-m) (1-10%) = 90% (n-m)

With the rapid development of computer technology, the price of computer is constantly decreasing. After a brand of computer is reduced by M yuan according to the original price, the price is reduced by 20%. Now the price is n yuan, so the original price of the computer is ()
A. (45N + m) yuan B. (54n + m) yuan C. (5m + n) yuan D. (5N + m) yuan

Suppose that the original price of the computer is x yuan, then (x-m) (1-20%) = n, x = 54n + M

With the rapid development of computer technology, the price of computer is decreasing. After the original price of a computer is reduced by 800 yuan, it is reduced by 20%, and the current price is 5600 yuan
What is the original price of the computer?

5600 divided by 0.8 plus 800 = 7800

The price of a TV set is 4140 yuan, 360 yuan lower than the original price. How many percent lower than the original price

After 18% price reduction, the price of a TV set is 2050 yuan per set. How much is the original price of this TV set?
Do it by solving the equation

The original price of this TV set was x yuan per set
(1-18％)x=2050
x=2500

The original price of a TV set is 3600 yuan and the current price is 2400 yuan. How much is the current price lower than the original price? (keep one decimal place)

(3600-2400) △ 3600 = 1200 △ 3600 ≈ 33.3%. A: the current price is about 33.3% less than the original price

The price of a TV set is 4000 yuan after 20% discount. The original price of this TV set is 5400 yuan

Let the original price of the TV set be x yuan
X*8/10=4000
X=4000*10/8
X=5000
A: the original price of 5400 yuan per set is wrong