In the line test exam, the quantitative relationship is a very important section, and it is also the top priority for candidates to prepare for the exam. Today, I will answer the question of economic profit in the quantitative relationship.
First, the basic economy
1. Characteristics of the question type
Keywords such as cost, selling price, and profit are available.
2. Ideas for solving problems
Equation Method:
Give specific**, ask for concrete**.
According to the formula, find the equivalence relationship and solve the column equation. Specific formula:
1.Profit = selling price - cost.
2.Profit Margin = Profit Cost.
3.Selling Price = Cost (1 + Profit Margin).
4.Discount = Selling price Original price.
5.Total price = unit price Quantity; Total Profit = Individual Profit Quantity.
Assignment:
Give the proportion to find the proportion or give only one quantity of three quantities (total price = unit price quantity). The principle of assignment is to try to make the data an integer, so the input price is often set to 10 or 100.
The question of economic profit is less difficult in the exam, while the basic economy mainly examines the basic concepts of formulas and the relationship between numbers, so you must pay attention to the relationship between the concepts when doing the questions.
3. Brush the questions to consolidate
2018 Jiangxi] The purchase price of a certain brand of arrowroot powder is 20 yuan, and now the price is reduced by 20% to sell, and the result is also a profit of 52% of the purchase price. So, how much is the price of this arrowroot powder?
a.36 b.37
c.38 d.39
Analysis] "20% price reduction" refers to a 20% price reduction on the basis of pricing, that is, a 20% discount. In the stem, the "purchase price of 20 yuan" is the cost, and 52% is the profit margin. The pricing sought in the question is the original ** before the discount. The set price is x yuan, which can be obtained according to the discounted selling price = cost (1 + profit margin), x (1-20%) = 20 (1 + 52%), simplified to 08x=30.4, then x=304รท0.8=38, corresponding to term c. Select C
4. Expansion
1.This question tests the most basic formula concepts, and you should be familiar with the relationships between numbers. For example, "the purchase price is 20 yuan, the price is reduced by 20%" is not the meaning of selling 16, but the price is reduced by 20% on the basis of the selling price, that is, the price is discounted by 80%, and the profit is 52% of the purchase price after the discount, and 52% is the profit margin.
2.Profit + percentage is the profit margin, 20% profit, that is, the profit margin is 20%.
3.A 20% price reduction is an 8% discount; The price reduction to 20% is a 2% discount.
2. Segmented timing
1. Characteristics of the question type
Q: What are the fees required under different charging standards?
2. Ideas for solving problems
Separate first and then summarize.
Separate first: Separate according to the charging standard, and each section is calculated separately;
Post-summarization: After the calculation, add and sum again.
The problem of segmented billing has a single idea, as long as there are different billing standards, one by one can be calculated and summed.
3. Brush the questions to consolidate
2016 Joint Entrance Examination] The water consumption of residents in a certain place is divided into two tiers, and the annual water consumption of households is 0 180 (inclusive) tons, and the water price is 5 yuan tons; The price of water above 180 tons is 7 yuan tons. If the indoor population is more than 5 people, the ladder water standard will be increased by 30 tons for each additional person. There are 5 people in Lao Zhang's family and 6 people in Lao Li's family, and last year's water consumption was 210 tons. Q: How much less is the per capita water bill of Lao Li's family than Lao Zhang's?
a.12 b.35
c.47 d.60
Analysis] It is known that "if there are more than 5 people in the household, for every 1 additional person, the ladder water standard will increase by 30 tons", if there are 6 people in the family, the original water standard is 180 tons, but now it becomes 210 tons, and 6 people within 210 tons are 5 yuan per ton. Total water fee: 180 5 + 30 7 = 1110 yuan for Lao Zhang's family, 210 5 = 1050 yuan for Lao Li's family. Per capita water bill: Lao Zhang's family 1110 5 = 222 yuan, Lao Li's family 1050 6 = 175 yuan, then 222-175 = 47 yuan, corresponding to item C. Select C
4. Expansion
There are two changes in this question, one is that the standard is also changing according to the change of the number of people; Second, the price of water below the standard is different from the price of water above the standard. First calculate the standard for each household, and then calculate the water price for each household according to the standard.