How can I estimate the remaining amount due to my friend after the factory closed due to the war, knowing that I invested $15,0 of his money in garment tailoring for two years without recording profits, and I sold remaining goods for $3,0, and I have repaid him $10,0 so far, taking into account that the agreement was based on profit and loss?

The answer to the posed question is summarized as follows: Losses in companies fall upon the capital, and each partner bears their share of the loss in proportion to their capital contribution, unless negligence or dereliction of duty on the part of the worker is proven, in which case the worker then bears the loss. The worker is considered a trustee of the mudarabah capital, and their statement regarding damage or loss is accepted unless proven otherwise. In the event of a dispute over whether an action constitutes negligence or not, experts are consulted. In this case, since the worker did not record the accounts for two years, this is considered negligence and dereleliction of duty, and he is obligated to guarantee the full capital of the partner, unless the partner agrees to something else.