Is Zakat due on the entire amount (88,000) or only on 20,000 of the cooperative family fund's assets, and is Zakat due on all participants, or on the borrowers, or on the non-borrowers?

Cooperative family funds vary in nature. Some are based on donations that are not returned to their owners, and thus no zakat is due on them. As for others, they lend to participants, and their money is returned to them. Zakat is obligatory on this type because the money has not left the ownership of its owner; it is considered to be like a loan. Zakat becomes obligatory on each participant if their share alone reaches the nisab, or if combined with other money they own. The hawl (one lunar year) is calculated from the time the nisab is reached. A participant borrowing from the fund does not affect the obligation of zakat, for money that is owed, if it reaches the nisab, is subject to zakat, and the debt is not deducted from the money being zakat-eligible.