What is the ruling on combining inherited money with money from usury to establish a charitable project (a laboratory for analyses) in which beneficiaries are given a discount equivalent to the percentage of the usurious money?

Usurious gains must be disposed of by spending them on the interests of Muslims or giving them to the poor and needy. It is not permissible to mix these gains with your own money to establish a joint project, because you would then benefit from ill-gotten wealth, and it would be difficult to distinguish the proportion of what is unlawful. Rather, it must be disposed of by donating it to a public hospital or distributing it to the poor and needy, even if they are relatives. It is permissible for the possessor of ill-gotten wealth to give it as charity to himself and his dependents if he is poor and takes from it only what he needs. If the money is given to the poor, it is not unlawful for the poor person; rather, it is lawful and good for him.