Sorry I missed you questions! The answer is zero.
The point is;
no non working mothers (married or single) make a
financial contribution to society. There are many millions of them. Ditto non working fathers.
But what most of them do contribute is care of their offspring and probably other members of their family, if there are any.
It's part of the huge amount of unpaid work which doesn't appear on any balance sheets or gets included in estimates of GDP.
There are other varieties of unpaid work going on everywhere - from obvious ones like voluntary work, onwards.
In fact it's the basic weakness/fallacy behind the "financialisation" of society and why it should be resisted. It's the elephant in the room!
https://views-voices.oxfam.org.uk/2023/08/a-flawed-gdp-bypasses-womens-unpaid-care-work/
Many extremely valuable things don't make a profit on paper - these include roads, libraries, schools, NHS, council housing, voluntary groups, etc.... a very long list of state provided services and other societal activities which generate no financial profit.
The market view of the economy says these things are thus worthless.
Obviously stupid, but even more stupid is for them to act upon it and selling them off to profiteers, which is largely why we are up dung creek and getting worse. We've had 45 years of this nonsense, PFI, and other sell offs etc.
https://cebr.com/blogs/unpaid-house...osier-picture-for-growth-during-the-pandemic/
https://weownit.org.uk/privatisation
They've even been selling off playing fields, town parks and looking greedily at national parks themselves. Greedy accountants rubbing their hands together!
Child care could be included in GDP if parent A paid parent B for looking after their children,
and vice versa.
There'd be measurable and taxable transactions but completely pointless except for satisfying the small minded accountants/politicians who run so much of our lives.
PS
Once again; worth revisiting
@Croolis comment.
He's only talking about paying benefits but the argument applies to so many other things which benefit us all but are "not profitable" appear in no balance sheets, or work at a massive loss.
https://www.ukworkshop.co.uk/threads/no-fault-evictions.148471/page-68#post-1759714