Percent knowledge points (tax rate, interest, discount, percentage)

1. A number indicating that one number is a percentage of another number is called a percentage. Percentage is also called percentage or percentage, and percentage is usually expressed as "%".

Second, the score and percentage comparison:

Similarity: indicates the relationship between two numbers.

Difference: it can represent specific quantity, with company name (score), no specific quantity and no company name (percentage).

Third, reciprocity of fractions, decimals and percentages.

(1) Decimalize the fraction and divide it by the denominator.

(2) Take the number of components in decimal, first rewrite the scores with components of 10, 100, 1000 ... and then lower the scores.

(3) Turn the decimal point into a percentage, first move the decimal point to the right by two places, and then add hundreds of semicolons.

(4) To change the percentage into a decimal, first remove the percent sign, and then move the decimal to the left by two places.

(5) Turn the fraction into a percentage, first turn the fraction into a decimal (three decimal places are generally reserved when it is used up), and then turn the decimal into a percentage.

(6) First rewrite the percentage number of components into the number of components, and the quotation that can be reduced becomes the simplest score.

Fourth, memorize the reciprocity of three commonly used numbers.

5. 1. Attendance rate indicates the percentage of attendees to the total number of people. 2. The qualified rate indicates that the number of qualified pieces accounts for a few percent of the total number of pieces. 3. The survival rate indicates that the number of surviving trees accounts for a few percent of the total number of trees.

6. To find the percentage of one number greater than another is to find the percentage of one number greater than another.

Seven, 1, more than "1"= a few percent more than 2, less than "1"= a few percent less.

Eight, the interest earned is pre-tax interest, and the interest earned is after-tax interest.

Nine. Interest = principal × interest rate× time

X accrued interest-interest tax = earned interest

Eleven, a few fold means a few tenths, which means ten percent; A few folds means a few tenths of a point and a few tens of percent.

12. 1, original price × discount = current price 2, current price ÷ original price = discount 3, current price ÷ discount = original price.

Thirteen, a few percent means a few tenths means dozens of percent; A few percent means a few tenths, a few tens.

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