![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
A store sells a commodity with a purchase price of 8 yuan at 10 yuan per piece, which can sell 200 pieces per day. Now it adopts the method of raising the selling price and reducing the purchase quantity to increase the profit. It is known that the daily sales volume of this commodity will decrease 10 pieces per day when the price increases by 0.5 yuan. If the commodity is to make a profit of 640 yuan per day, how much should the selling price be?
Suppose the price is x yuan, according to the equation, we get (X-8) (200-x − 100.5 × 10) = 640, and the solution is X1 = 12, X2 = 16. Because we increase the profit by increasing the selling price and reducing the purchase quantity, we should set the selling price of each piece at 16 yuan, so that the daily profit can be 640 yuan
RELATED INFORMATIONS
- 1. Put a square with a side length of 1cm horizontally in turn to form a rectangle. Like this, use M squares to form the circumference of the rectangle
- 2. Given that the area of parallelogram ABCD is 4 and O is the intersection of two diagonals, then the area of △ AOB is______ ．
- 3. The diameter of circle a is 8 cm, which is 40% of the diameter of circle B______ Cm
- 4. Simplification and calculation Calculate that the square of a minus the square of B plus the square of 2B minus 1 / a minus the square of B plus a plus B, where a plus B equals 2000
- 5. How to use dash in English we kown that she tried to learn about every thing she found--I believe she would have much to say about the many countries she lived in. Why change a dash to a semicolon?
- 6. The perimeter of a rectangle is 24cm, and the ratio of length to width is 5:1. What is the area of the rectangle?
- 7. 1. It is known that the equation A & # 178; X & # 178; + (2a-1) x + 1 = 0 has two real number roots x1, x2. (1) when a is what value, x1 ≠ x2; (2) whether there are real number roots which are opposite to each other? If so, find out the value of a; if not, explain the reason
- 8. (+ 7 3 / 4) + (- 5 11 / 11) + (- 3 1 / 4) + (- 6 5 / 11) + (+ 17 1 / 4) + (+ 1 1 1 / 4)
- 9. How many hours is three hours and nineteen minutes?
- 10. What is the relationship between the zeros of functions and the roots of equations?
- 11. A store sells a certain commodity with a purchase price of 8 yuan at 10 yuan per piece, which can sell about 100 pieces a day. A store wants to increase its profit by reducing the selling price and increasing the sales volume. Through market research, it is found that the sales volume of this commodity can increase about 10 pieces for every 0.1 yuan decrease in the unit price of this commodity. How much yuan can reduce the selling price of this commodity to maximize the sales profit?
- 12. A store sells a commodity with a purchase price of 8 yuan at 10 yuan per piece, and it can sell about 100 pieces a day. The store wants to increase its profit by reducing the selling price and increasing the sales volume. After market research, it is found that the sales volume of this commodity can increase about 10 pieces with a decrease of 0.1 yuan per unit price. In order to maximize the sales profit, it is necessary to reduce the selling price of this commodity______ Yuan
- 13. If a store sells a commodity with a purchase price of 8 yuan at 10 yuan per piece, it can sell 200 pieces per day. Now it increases the selling price to make more profits. It is known that the sales volume of the store will decrease by 10 pieces for each price increase of 0.5 yuan. When we set the selling price, we can make the maximum profit per day? What is its maximum profit?
- 14. 1.4 times the square of x minus 25y is equal to? （ 1/4*x^2-25y^2 ) 2. The square of (x + y) minus the square of Z (x+y)^2-z^2 3.2ab-a^2-b^2 4.x^2*y^2+1-2xy
- 15. If the purchase price of a commodity is doubled and the price is marked, how much discount can we get if we want to get a 20% profit margin For example: how much discount can I get if I double the price of a commodity to get a 20% profit margin? Yes, there is a reward!
- 16. 1. Let "● and" ■ "denote different objects respectively. As shown in the figure, the first two balances shall be balanced. If the third balance is to be balanced, then the number of ■ to be placed at"? "Is () A.5 B.4 C.3 D.2 2. If (2y-3x) / 5 = 1, then 9x-6y= 3. In y = KX + B, when x = - 1, y = 5, then k =, B= 4. Given that x = 3 / 5, y = 6 / 5 is the solution of the system of equations x + 2Y = 3, 3y-x = 3, then the intersection coordinates of the linear functions y = - 1 / 2x + 3 / 2 and y = (x / 3) + 1 are 5. The solutions of the system of equations 3x-y = 26x-2y = 4 are - system 6. Given that the sum of X and Y in the solution of the system of equations 2x + y = 3 ax + 2Y = 4-A is 1, then a= The first one is multiple-choice questions. All of the following questions are filled in the blanks. Just get the right answer, Question 1: two on the left, one on the right, and one on the left One on the left, one on the right and one on the right of the second The third one is on the left, one is on the right? The third question: in y = KX + B, when x = - 1, y = 0; when x = 1, y = 5. Then k =, B=
- 17. A shopping mall wants to buy 50 pieces of a and B commodities. The price of a commodity is 35 yuan per piece, and the profit rate is 20%. The price of B commodity is 20 yuan per piece, and the profit rate is 15%. The total profit is 278 yuan. How many pieces of a and B commodities do you buy?
- 18. The original price of a brand MP5 is 360 yuan, but now it's 15% off. It's ()%, and the current price is 306 yuan
- 19. In a shopping mall, a mobile phone with the original price of 2500 yuan is sold at a 25% discount. How much cheaper is the selling price of the mobile phone?
- 20. During the festival, all goods in a shopping mall are sold at a 15% discount. The original price of a suit is 420 yuan, but how much is the current price? Xiao Li actually paid 289 yuan for a bicycle. How much was the original price of the bicycle?