Percentages, also known as percentages or percentages, indicate that one number is a percentage of another. Tip: It refers to the rate, not the quantity. It has three types of application problems (in fact, there are more than three, and we only learn three): for example, there are 1: there are 160 students in the sixth grade, and there are 120 students who meet the standard, which requires a compliance rate. 160 part120 *100% = 0.75 *100%. Example 2: originally planned afforestation 12 hectares, actually afforestation 14 hectares. What percentage has it actually increased compared with the original plan? 14- 12=2 (hectares) 2/ 12= 16.7% Example 3: Library collections 1400 volumes, with an increase of 12% this year. How many volumes are there now? 1400 *12% =1681400+168 =1568. What other discounts, taxes and interest rates will not be mentioned one by one. A few percent is a few percent! Tax and interest rate are: interest = principal * interest rate * time. Multiply this number by 500%. Because you have to pay 5% tax. You got it? You got it? I'm finished!