The following observations were made on 4% dillution of waste water.
D.O. of aerated water used for dilution = 4 mg/l
D.O. of diluted sample after 5 days incubation = 0.6 mg/l
D.O. of original sample = 0.5 mg/l
Assure the deoxygenation coefficient at test temperature as 0.1.
Question : Ultimate BOD of the sample will be