In some tests to determine the BOD of a water sample, inorganic chemicals get oxidized and therefore contribute to the measured BOD. A water sample contains 40 mg/L of degradable organic waste with an average composition of C6H10O2 and kd=0.2 d.. Tt also contains Ю mL of Mn2. During the test, the Mn2 is all oxidized and precipitates as MnO2(s). For the manganese oxidation reaction, include O2 and H20 as reactants. What fraction of the measured BODs is attributable to the manganese?