The comparison is not real indeed as after 20 years, as in case of rent you will end up with expenses of 0.46 cr and will continue to incur for rest of life, but if you buy a house you will end with property worth 2cr at a cost of 0.74 cr and not required to expend anything for rent or emi.
The benifit will start after 20th year when you realy need it.
