When renting a house, is there a proper ratio between the rental income and the property management fee charged?

In addition to paying property tax, rental income should also pay business tax in accordance with the "leasing industry", with a tax rate of 5%.

There is a certain standard for the collection of property management fees, which is based on the grade of the property company and is collected according to the standard after being approved and publicized by the competent price department, and cannot be collected at will.