One yuan quadratic equation application problem. Store a sells a certain commodity with a purchase price of 8 yuan at 10 yuan per piece, and 100 pieces can be sold in one day A store sells a certain commodity with a purchase price of 8 yuan at 10 yuan per piece, which can sell 100 pieces a day. The owner wants to increase the profit by reducing the price and increasing the sales volume. After market research, it is found that the sales volume of this commodity can increase by 10 pieces when the unit price of this commodity decreases by 0.1 yuan. How much yuan can the daily sales profit reach 225 yuan?

If the selling price is set at x yuan, the daily sales profit is 225 yuan, the sales volume is 100 + (10-x) * 10 / 0.1, and the profit of each piece is (X-8), then the equation [100 + (10-x) * 10 / 0.1] * (X-8) = 225,4x ^ 2-76x + 361 = 0, (2x-19) ^ 2 = 0, x = 9.5 is given

If a store sells a commodity at 10% off the marked price, it will make a profit of 25 yuan. If it sells a commodity at 20% off the marked price, it will lose 20 yuan?
The solution of linear equation with one variable!

0.9X-25=0.8X+20 X=450

If the price of a commodity is increased by 20% on the basis of the purchase price, and then it is sold at a 10% discount, making a profit of 20 yuan, then the purchase price is 20 yuan______ Yuan

Suppose the purchase price of this commodity is x yuan. According to the meaning of the question, we can get: (1 + 0.2) x · 0.9-x = 20, and the solution is: x = 250. Then the purchase price of this commodity is 250 yuan

The original price of a commodity is 150 yuan, and the current price is 120 yuan. How much is the price reduction?

To ask what percentage of the price reduction means to ask how much the price reduction is based on the original price, that is, divide the reduced price by the original price and multiply it by 100%: (150-120) / 150 * 100% = 20%
After 20%, you can bring 20% into the original question to understand how much the price of 150 yuan commodity will be after 20% price reduction, that is 150-150 * 20% = 120 yuan, so you can understand

A commodity, the current price is 180 yuan, 20 yuan cheaper than the original price, then the current price is cheaper than the original price______ %．

A: the current price is 10% cheaper than the original price

The current price of a commodity is 80 yuan, which is 20 yuan less than the original price. How much cheaper is it?

20/（80+20）=20%

The current price is 320 yuan. The current price is 80 yuan cheaper than the original price. How much cheaper is this product?

20％

A commodity is 80 yuan after it is 16 yuan cheaper. How much lower is the current price than the original price

It's 1 / 6 cheaper, the original price is 96 yuan, 16 / 96 = 1 / 6

The current price of a schoolbag is 80 yuan, which is 20 yuan lower than that in the past
A. （80-20）÷80B. 20÷80C. 20÷（80+20）D. 20÷（80-20）

20 △ 20 + 80, = 20 △ 100, = 20%; a: reduced by 20%

The price of a commodity is 20% lower than the original price for the first time and 16% lower for the second time. How much is the current price lower than the original price?

First price reduction: 100% - 20% = 80%
The second price reduction: 80% × 16% = 12.8%
A: the current price is 12.8% lower than the original price

If a store sells a commodity at 10% off the marked price, it will make a profit of 25 yuan. If it sells a commodity at 20% off the marked price, it will lose 20 yuan? The solution of linear equation with one variable!