What is the past and present life of percentage?

The past and present life of percentages are:

The origin of percentages. More than 200 years ago, the Swiss mathematician Euler said in the book "Universal Arithmetic" that if you want to calculate a 7-meter-long Dividing a rope into three equal parts is impossible because a suitable number cannot be found to represent it.

If we divide it into three equal parts, each part is 7/3 meters, it is a new number, we call it a fraction. Then, people invented percentages based on fractions and using 100 as the base.

Today’s percentages are widely used in industrial and agricultural production, science and technology, and various experiments. Especially when conducting surveys, statistics, analysis and comparisons, percentages are often used.

Contemporary applications of percentages:

Every day in the weather forecast program on TV, the weather conditions, precipitation probability, etc. for that night and tomorrow's day will be reported, reminding everyone to prepare in advance Be prepared. For example, the probability of precipitation tonight is 20%. There will be strong winds of level 5 to 6 tomorrow during the day, and the probability of precipitation is 10%. You should wear more clothes in the morning and evening. 20% and 10% are clear and concise.

The weather forecast program on TV will report the weather conditions, precipitation probability, etc. that night and tomorrow during the day. For example: The probability of precipitation tonight is 20%.

A macroscopic description of the experimental subjects when publishing the results of the survey. For example: An experiment concluded that people who often read text messages will have a 10% drop in IQ.