Following information is given for a drilling operation to be carried out for overburden removal in a surface mine.

Volume of rock blasted per round, m³ : 3,20,000

Number of blast holes : 100

Drill hole diameter (D), mm : 200

Length of subgrade drilling : 8D

Stemming length : 25D

Bench height, m : 30

Powder factor, m³/kg : 3.2

The amount of explosive per unit length of charge in kg/m, is_______.
(round off to two decimal places)