Knowledge points and reference answers
For products, the current price is a few percent of the original price, called discounts. Commonly known as “discount”.
A few % off is a few tenth, which is dozens of percent.
For example: 20 % off = 8/10 = 80 ﹪,
Five % off 5 = 6.5/10 = 65/100 = 65 ﹪ ﹪
The key to solving discounts is to first convert the number of discounts to percentage or score, and then answer the solution method of a few percent (a few percent) more than a number (few) percentage.
The product is now 20 % off: the current price is 80 ﹪
The product is now 40 % off: the current price is 65 ﹪ ﹪
Page 8 to do it
1. In order to give back to the society, a certain electrical company sells to farmers’ friends in a certain type of TV in a 87 % discount. Farmers can save 169 yuan when buying one. Is it?
169 ÷ (1-87%) = 1300 (dollars)
Answer: The original price of this model is 1300 yuan.
2. Zhang Ze went to buy orange juice and saw the same orange juice in two different supermarkets. There were different promotional activities: 12 yuan per bottle in A supermarket, buying four free one; 12 yuan per bottle in B Supermarket, 10 % off. Zhang Ze wants to buy 5 bottles, which supermarket to buy?
A supermarket: Buy four get one free, it takes 12 × 4 = 48 (dollars)
B supermarket: 12 × 5 × 85%= 51 (dollars)
48 <51 Answer: Go to the supermarket to buy.
3. The entry price of a remote control toy aircraft plus 50 yuan is the pricing. The obvious father bought him a 20 % discount toy aircraft, and the mall also made 16 yuan. What is the price of this remote control toy aircraft?
Solution: The entry price of remote control toy aircraft is X yuan.
(x + 50) × 80% -x = 16 x = 120
Answer: The entry price of this remote control toy aircraft is 120 yuan.