In a BOD test using 5% dilution of the sample (15 ML of sample and 285 mL of dilutuion water) dissolved oxygen values for the sample and dilution water blank bottles after five days incubation at 20o C were 3.80 and 8.80 mg / L respectively. Dissolved oxygen originally present in the undiluted sample was 0.80 mg /L. The 5-day 20o C BOD of the sample is
116 mg/L
108 mg/L
100 mg/L
92 mg / L