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Payment to the brokerages is depends upon the assistance extended by him in securing the property . But he has no absolute right to demand more on the basis of value of the property .
Very important aspect is that for purchasing of any property, it is better to approach any professional brokers. As far as payment is concern there is no fixed payment structure in the eyes of law , by mutual understanding you can make payment on the basis of his assistance.
Muralidara ( Advocate)

There is no any fixed payment structure to the brokers , but depends upon the service rendered by the broker in securing property.
Rmuralidara ( advocate )