How many years can patent accounting be popularized?

1. When purchasing a patent:

Borrow: intangible assets -XX patent 30

Loan: bank deposit 30

2. Amortization at the end of the year:

Debit: management fee 3

Loan: accumulated amortization 3

Third, buy a house.

Borrow: investment real estate 1000.

Loans: bank deposits

4. What's the rent? According to the cost, what is the service life?

Earn rental income

Debit: bank deposit loan: other business income

Depreciation or amortization

Borrow: other business cost loan: accumulated depreciation (amortization) of investment real estate is carried forward to the corresponding cost.