On New Year s Day, a shopping mall carried out preferential activities for a certain brand of shoes,

Solution: 1) The price of shoes with a price of 450 is 450<500, so 7% off is calculated, and the payment payable is:

450*70%=315 (yuan).

Shoes with a price of 550, because 550>500, are converted by 8 first, 550*80%=440 (yuan).

Therefore, the payable after the discount is 440-2*60 = 320 (yuan).

2) If the original price is less than 500 yuan, it will be converted according to 7, which is: 336 = 480 (yuan), which meets the condition of less than 500 yuan.

If the original price is more than 500 yuan, calculated according to 750 yuan, the 20% discount is 750 * 80% = 600 (yuan), because the original price is known to be less than 750 yuan, so after the 20% discount, more than 400 yuan and less than 600 yuan, you can also discount 120 yuan.

In this case, the original price is:

336+120) = 570 (yuan), which also meets the conditions of greater than 500 yuan and less than 750 yuan.

Therefore, the original price of this shoe may be 480 yuan or 570 yuan.

1) 450<500, so calculated according to seven folds, that is, yuan).

550>500, so yuan), 440>200, therefore, subtract another 60 yuan, that is, 440-60 = 380 (yuan).

2) (336+60) RMB).

If the purchase price of each TV is X yuan, the purchase price will be increased by 35% (1+35%)X, and then after a nine-percent discount, the selling price after sending another 50 yuan for the road fee is, and then according to the profit of 208 yuan, you can list the equation

Solution: The purchase price of each TV set is X yuan

According to the title: x=1200

A: The purchase price of each TV is 1200 yuan

Summary. Hello, this question is here, because after the price increase, his base has become larger, and then 20% of this base is 1 5, so. This will drop more than the first **.

The ** after the price increase of 1 5 is different from the original**, and the ** after the price increase of 1 5 is used, so the loan will be a lot less. This one is an area where it is easy to go wrong. The base is not the same.

I hope this answer can help you, and if you have any questions, you can continue to ask me, and I wish you a happy life and a happy day. 

A shoe store in order to ** come up with a trick, the day before May Day will raise the price of all shoes by one-fifth, and on the day of May Day, the price will be reduced by one-fifth to attract customers, sure enough, the business is good, but at the end of the day, the boss found that the loan is a lot less, the boss wonders, the price increase and price reduction are one-fifth, should be the same as the original price, how can it be less? Students, can you help this insole boss find out the problem in**?

Hello, this question is here, because after the price increase, his base has become larger, and then 20% of this base is 1 5, so. This will drop more than the first **. The ** after the price increase of 1 5 is different from the original**, and the ** after the price increase of 1 5 is used, so the loan will be a lot less.

This one is an area where it is easy to go wrong. The base is not the same. I hope this answer can help you, and if you have any questions, you can continue to ask me, and I wish you a happy life and a happy day.

Hello If you have any doubts, you may wish to say it, I will analyze it If you think mine is good, you can move your little finger to give a thumbs up Thank you. Once again, I wish you a happy life and a happy day

Department stores to engage in ** activities, a brand shoes every 200 yuan minus 100 yuan, to brand shoes "discount on the first six discounts, and then on the basis of this collapse and then nine or five discounts, if both brands have a pair of shoes with a price of 260 yuan, buy the brand of envy is more convenient brother Bu Yi?

Hello, I am very happy to serve you, for you to make the following answers: department stores to engage in ** activities, a brand shoes every 200 yuan minus 100 yuan, to brand shoes "discount is the first six discounts, and then on the basis of nine or five discounts, if both brands have a pair of shoes with a price of 260 yuan, buy which brand is cheaper? Due to the fold-to-fold activity of brand A shoes, it is ultimately cheaper, so it is more cost-effective to buy brand A shoes.

The specific calculation method is as follows:1A brand shoes:

260 yuan 6 fold = 156 yuan, multiplied by 95 fold, the final ** is yuan; 2.B slow big brand shoes: 260 yuan 95% off = 247 yuan, compared with the two, A brand shoes are cheaper.

In addition, if the purchase amount reaches 200 yuan, you can enjoy a discount of 100 yuan for the discount activity, and the final ** is lower, so it is more cost-effective to buy Yanna Li Jia brand shoes. The above is the reason and solution for the delay in making brand A shoes more convenient. Personal Tips:

When buying goods, be sure to keep an eye out for discount activities and actively participate in them, you can save a lot of money.

Summary. Brand A is full of 200 minus 100, so the actual payment for 260 yuan shoes is 160 yuan, and brand B first pays six discounts and then nine or five discounts, so 260 times multiplied equals 148 points 2 yuan, so brand B is cheaper!

Department stores to engage in ** activities, a brand shoes every 200 yuan minus 100 yuan, to brand shoes "discount on the first six discounts, and then on the basis of this collapse and then nine or five discounts, if both brands have a pair of shoes with a price of 260 yuan, buy the brand of envy is more convenient brother Bu Yi?

Brand A is full of 200 minus 100, so 260 yuan shoes actually pay 160 yuan, and brand B grinds the year first six discounts and then nine or five discounts, so 260 times Lu quietly multiplied equals 148 points 2 yuan, so B accompanies the slag brand is cheaper!

My mother has 10,000 yuan, and there are two ways to manage money: one is to buy three-year treasury bonds, and the annual profits and taxes of rock socks; The other is to buy the bank's one-year rough financial products, with the expected annual income, and you can continue to buy them with principal and interest after the expiration of each year, and the next year's financial products are suspicious. If the expected annual income tax of wealth management products can be realized, after 3 years, what is the difference between the benefits of the two financial management methods?

For the first type, 335 times trembling 3 is equal to 1005 yuan, and for the second type of financial management, 10000 times the rent of the nightshade is multiplied by multiplying and then subtracting 10000 is equal to about 1120, the difference is 115 yuan.

Solution: If the original price of product A is X yuan, the original price of product B is 500-x yuan.

I tidy it up and get it. x=320

500-320 = 180 (yuan).

The original price of product A was 320 yuan, and the original price of product B was 180 yuan.

Solution: Set the original sales of A and B commodities ** respectively x and y yuan, and get x + y = solution x = 320y = 180 according to the title Answer: The original sales prices of A and B are 320 yuan and 180 yuan respectively.

Set a commodity x yuan, B commodity Y yuan.

70%x+90%y=386

x+y=500

7x+9y=3860

7x+7y=3500

2y=360

y=180x=320

The original price of product A is 320 yuan, and the original price of product B is 180 yuan.

Let A be $x, then B is $500-x, and there is x*

The solution is x=320500-320=180

Let A be $x, then B is $500-x, and there is x*

The solution is x=320

(1) According to the title, 3000 m

m-20 is sorted out, 3000 (m-20) = 2400m, the solution is m = 100, after testing, m = 100 is the solution of the original fraction equation, so, m = 100;

2) If you purchase x pairs of type A sneakers, then type B sneakers (200-x) pairs, according to the title, 240-100) x + (160-80) (200-x) 21700

240-100)x+(160-80)(200-x)≤22300②

Solve the inequality to get , x 95, solve the inequality to get, x 105, so the solution set of the inequality group is 95 x 105, x is a positive integer, 105-95 + 1 = 11, there are 11 schemes;

3) Let the total profit be w, then w = (240-100-a) x + 80 (200-x) = (60-a) x + 16000 (95 x 105), when 50 a 60, 60-a 0, w increases with the increase of x, so, when x = 105, w has a maximum value, that is, at this time should be purchased 105 pairs of A sports shoes, 95 pairs of B sports shoes;

When a=60, 60-a=0, w=16000, all schemes in (2) have the same profit;

When 60 A 70, 60-A 0, W decreases with the increase of X, so when X = 95, W has a maximum value, that is, 95 pairs of A sneakers and 105 pairs of B sneakers should be purchased at this time