What is the ruling on the permissibility of opening a phone service shop if its capital was amassed from a trade mixed between the lawful (foodstuffs) and the unlawful (beer or alcohol)?

Unlawful money must be disposed of if its amount is known, and the rest of the money is lawful. Repentance is achieved by returning the money to its owner if found, otherwise, it should be given as charity on their behalf. If the amount of lawful and unlawful money is indistinguishable, then the unlawful portion should be estimated and thoroughly investigated until one's liability is cleared.