ومعرفة مقدار رأس المال إذا كان مما يتعلق العقد على قدره
Translation: The amount of advance capital must be known when the contract depends on its quantity.
For Abu Hanifa, if the advance capital is of a kind whose quantity defines the contractual countervalue—by weight, measure or count—its quantity must also be known. Merely pointing to a bag as “the payment” does not suffice when the amount remains unknown.
If some coins later prove defective or the bargain must be unwound, the parties need to know what quantity formed the original price. Stating and paying an exact Rs 80,000 ordinarily resolves that numerical uncertainty.