Section 127(a) in The Bihar Government Estates (Khas-Mahal) Manual, 1953
(a)Management. - The management charges are calculated at 8½ per cent on the average actual collections of the penultimate year and the two previous years from all such estates whether the property of Government or of recusant proprietors as are held direct, but not on collections from estates farmed or leased and Government place an allotment at the disposal of the Board in the form of a contract grant for a period of five years.