\x09 percentage refers to the ratio of two numbers, so it is also called percentage or percentage.

One thousandth: indicates that one number is one thousandth of another.

Main connections and differences between percentage and score:

Connection: Both can express the multiple relation of two quantities.

Difference:

1. has different meanings: percentage only indicates the multiple ratio of two numbers, and cannot indicate the specific quantity, so it can't take units;

Fraction can not only represent specific numbers, but also the relationship between two numbers.

② The percentage of molecules can be integers or decimals;

\x09 The numerator of the score cannot be a decimal, but only a natural number other than 0.

4, the percentage of writing: usually do not write in the form of fractions, but after the original molecule with "%".

Second, the percentage and fraction, decimal exchange

(1) Exchange of percentages and decimals:

1, decimal percentage: the decimal point is moved to the right by two places, followed by hundreds of semicolons.

2. Decimal percentage: move the decimal point to the left by two places and delete the percent sign.

(b) Percentage and score of reciprocity

1, percentage component number:

\x09 Divide the percentage into component numbers first, and then rewrite the percentage as whether it is 100, which can be simplified to the simplest fraction.

2. Percentage of scores:

(1) using the basic properties of the fraction, the denominator of the fraction is enlarged or reduced, and then written as a percentage.

(2) first convert the fraction into a decimal (usually keep three decimal places when it is not used up), and then convert the decimal into a percentage.

(2) Discount

1. discount: a few percent of the original selling price is called discount. Also known as "discount".

\x09 discount means a few tenths, that is, dozens of percent. For example, 20% discount = = 20% discount, 65% discount = 0.65 = 65%.

2. Ten percent is one tenth, which is 10%. 35% is 3.5% over ten thousand, which means 35%.

(3) Paying taxes

\x09 1, tax payment: tax payment refers to paying part of the collective or individual income to the state according to the relevant provisions of the national tax law.

\x092。 Significance of tax payment: tax payment is one of the main sources of national fiscal revenue. The state uses the tax paid to develop economy, science and technology, education, culture and national defense security.

3. Taxable amount: The tax paid is called taxable amount.

4. Tax rate: The ratio of taxable amount to various incomes is called tax rate.

5. Calculation method of tax payable: tax payable = total income × tax rate

(4) Interest

1. Deposits can be divided into demand deposits, lump-sum deposits and lump-sum deposits.

\x092。 Significance of saving: People often deposit temporarily unused money in banks or credit cooperatives, which can not only support national construction, but also make personal use of money safer and more planned, and increase some income.

Principal: Money deposited in the bank is called principal.

4. Interest: The excess money paid by the bank when withdrawing money is called interest.

5. Interest rate: The ratio of interest to principal is called interest rate.

6. Calculation formula of interest: interest = principal × interest rate × time.

7. Note: If you want to pay interest tax (interest on national debt and education deposits is not taxed), then:

\x09 After-tax interest = interest-taxable interest amount = interest-interest × interest tax rate = interest ×( 1- interest tax rate)