A store bought 100 a-clock products and 80 B-type products from the wholesale Department of a company. The total cost was 2800 yuan. When the store retailed, the price of each A-type product was increased by 15%, and that of each B-type product was increased by 10%. After all the products were sold, the total income was 3140 yuan. How much was the purchase price of a and B-type products?

A store bought 100 a-clock products and 80 B-type products from the wholesale Department of a company. The total cost was 2800 yuan. When the store retailed, the price of each A-type product was increased by 15%, and that of each B-type product was increased by 10%. After all the products were sold, the total income was 3140 yuan. How much was the purchase price of a and B-type products?

Suppose the purchase price of a commodity is x, then we can get the purchase price of B commodity is: 80 = 35-1.25x, from which we can get: 100 × (1 + 15%) x + 80 × (1 + 10%) × (35-1.25x) = 3140

One yuan one time equation -- discount sale
1. After a 25% increase in the price of a commodity, what percentage should be reduced to restore the original price?
2. A store sells two pieces of clothes at 60 yuan each. One of them earns 25% and the other loses 25%. So does the store earn or lose, or not?

1. If the percentage is set to x, then there is:
1*（1+0.25）*（1-x/100）=1;
1-x/100=0.8;
x/100=0.2;
x=20;
So the percentage of reduction is 20%
2. Earning = 60-60 ÷ (1 + 0.25) = 60-48 = 12 yuan;
Deficit = 60 ÷ (1-0.25) - 60 = 80-60 = 20 yuan;
So loss = 20-12 = 8 yuan;

The solution of equation of one variable is related to discount sale
1. The total cost of two pieces of clothing is 500 yuan. In order to obtain higher profit, the store owner decides to price the clothing at 50% of the profit and the clothing at 40% of the profit. In the actual sales process, the two pieces of clothing are sold at a 10% discount according to the customer's requirements, so that the store gets a total profit of 157 yuan. How much is the cost of two pieces of clothing?
2. XiaoCong and his mother go shopping together. They find that there is a sales promotion (the information is as follows) XiaoCong and his mother buy granny 300 yuan nutriment and let XiaoCong pay for it. XiaoCong finds his mother's favorite lily at the cash register. The price is 2.5 yuan. How many lilies can he buy most without extra money?
Promotion information: below 100 yuan, no discount;
10% off for all over 100 yuan and below 300 yuan;
More than 300 yuan (excluding 300 yuan), 20% off for all
PS: Please attach the solution steps, do not directly type the results

1. The total cost of the two pieces of clothing is 500 yuan. In order to get a higher profit, the store owner decides to price the clothing at 50% of the profit and the clothing at 40% of the profit

The problem of one dollar one time equation discount sale in Grade Seven
Brother, help me write and answer

A store will increase the purchase price of each color TV by 40% to mark the selling price, and then announce in the advertisement that it will sell at a discount of 20%. As a result, each color TV earns 300 yuan. How much is the purchase price of each color TV?
Set the purchase price of each color TV set as X Yuan
According to the meaning of the title: (1 + 40%) x × 80% - x = 300
The solution is: x = 2500
After examination, it is consistent with the meaning of the question
A: the price of each color TV is 2500 yuan