It depends the valuation model adopted for calculating the worth of the asset. Terms of purchase normally do include future cash flows as well. Hence the valuation of cash flows and asset gives true value for each owner. Learning valuation is not a complex task. It is so easy learn with an example. In general parlance, the worth of Ali is 250000 ie 50% of 500000. If you would like to learn more about valuation and accounting kindly reach out to [email protected]