Five-days BOD of a 10% diluted sample having Do = 6.7 mg/l, Ds = 2 mg/l and consumption of oxygen in blank = 0.5 mg/l will be

Five-days BOD of a 10% diluted sample having Do = 6.7 mg/l, Ds = 2 mg/

1.	Five-days BOD of a 10% diluted sample having Do = 6.7 mg/l, Ds = 2 mg/l and consumption of oxygen in blank = 0.5 mg/l will be
A.	22 mg/l
B.	42 mg/l
C.	62 mg/l
D.	82 mg/l
Answer» C. 62 mg/l