Answer:
(Fatwa: 247/247=M/1430)
If they are not human bones rather animal bones and you own them, then you can sell them. The ratio of profit is not fixed, you can sell them on the price you purchased or more than that. But, it is wrong to take advantage of one’s helplessness and take more than normal profit.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
