What is the obligatory amount of a wife's maintenance upon her husband, taking into account that the wife works and contributes to some expenses?

The wife's maintenance is obligatory according to what is customary and is estimated based on sufficiency, including food, clothing, and housing. It varies according to the financial situation of the spouses, whether affluent or in hardship. The obligation of maintenance is not affected by the wife having a salary, as the wife's money is her right to dispose of as she wishes.