The calculation method of one-year interest of 300 billion deposit banks is as follows:

When the deposit interest rates are 1 and 1.5%, the deposit interest is 4.5 billion yuan.

2. When the deposit interest rate is 2.5%, the deposit interest is 7.5 billion yuan.

3. When the deposit interest rate is 3.5%, the deposit interest is 654.38+005 billion yuan.

4. When the deposit interest rate is 4.5%, the deposit interest is 65.438+03.5 billion yuan.

5. When the deposit interest rate is 5.5%, the deposit interest is 65.438+065 billion yuan.