The biggest problem in the exam is that we take a long time to do the questions, and if we want to save the time to do the questions, we need to be very familiar with the test center, and today we will share with you the content of the high-frequency test center - the proportion.
1. Concept
Weight: The percentage of the partial value to the overall value.
2. Basis for judgment
Regarding the weighting of the test center, most of the test questions will mention two key words: "occupy" and "where":
1. "Occupy" is a part in front and a whole in the back;
2. "Wherein" is followed by a part.
3. Common test centers
1.Current weighting
Example 1: From January to June 2020, the total profit of industrial enterprises above designated size in China was 25,114900 million yuan, of which the profits of state-controlled enterprises totaled 6614$100 million.
Question: From January to June 2020, what percentage of the total profits realized by state-controlled enterprises accounted for about 10% of the total profits of industrial enterprises above designated size in the country?
a.26.3% b.37.2% c.22.1% d.31%
Answer] a. Analysis: According to the consistency of the problem time and the material time, determine the current proportion, the key word of the problem is "occupy", the first part of the "account" is the total profit realized by the state-owned holding enterprises, and the overall profit of the industrial enterprises above designated size after the "account" is obtained, so this question is selected a.
2.The proportion of the base period
Example 2: In 2013, the per capita total income of urban households nationwide was 24,219 yuan, an increase of 12 over the previous year5%。Among them, the per capita wage income was 12,134 yuan, an increase of 87%, and the per capita transfer income was 3,754 yuan, an increase of 130 yuan over the previous year.
Question: In 2012, what percentage of the per capita wage income of the total per capita income of urban households in China was ??
a.56.2% b.51.9% c.50.1% d.62.3%
Answer] B. Analysis: According to the inconsistency between the problem time and the material time, determine the proportion of the base period, and the material ** keyword "wherein", "wherein" is followed by the part, that is, the part is the per capita wage income, and the growth rate is 87%, which is the overall per capita total income of urban households in the country, with a growth rate of 125%, obtainable, so choose b for this question.
3.The amount of growth in the proportion of the weight
Example 3According to the data of the National Bureau of Statistics, at the end of 2015, the number of civilian vehicles in the country reached 172.28 million (including 9.55 million three-wheeled vehicles and low-speed trucks), an increase of 11 over the end of the previous year5%, of which the number of private cars was 143.99 million, an increase of 144%。
Question: How much did the proportion of private car ownership in 2015 increase compared with 2014?
percentage points?a.Up 21 percentage point bDropped by 21 percentage point.
c.Dropped by 29 percentage points dUp 29 percentage points.
Answer] a. Analysis: According to the consistency between the time of the question and the time of the material and the method of questioning, the proportion of the increase is determined, and the known part of the question stem is the number of private cars, and the growth rate is 144%, the overall number of civilian cars in the country, with a growth rate of 115%, available.
The simplified calculation is divided into three steps:
Step 1: To determine whether to rise or fall, just observe the "partial growth rate - overall growth rate" and the result is exactly negative, only and 144%-11.The positive and negative correlation of the 5% results is equivalent to comparing the magnitude of the growth rate of the part and the growth rate of the whole;Step 2: Calculate the absolute value of the difference in growth rate, and finally select the option that is less than the absolute value. The reason why the final result is less than the absolute value is because we observe the formula of the increase in the specific gravity, the previous fraction is expressed as the specific gravity, and its value range is 0-1, usually it is a number greater than 1, and the real result is less than ,
Quickly pick out answer A.