If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21 C, B.O.D. of the sewage is

If the depletion of oxygen is found to be 5 ppm after incubating a 2.5

1.	If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21 C, B.O.D. of the sewage is
A.	50 ppm
B.	100 ppm
C.	150 ppm
D.	200 ppm
E.	250 ppm.
Answer» E. 250 ppm.