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Who can carefully teach me all the problems of percentage application in the first volume of sixth grade mathematics?
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!