Section 797(4)(iii) in Police Regulations, Bengal , 1943
(iii)The number of prizes to be allotted to each Range shall be fixed by the Inspector-General in January each year with reference to the total strength of Inspectors and Sub-Inspectors of the Unarmed Police employed in the Range, at the rate of one prize for every thirty officers, the proportion being that for every 16 such prizes five will be for Rs. 15, five for Rs. 10 and six for Rs. 5.