2. a result of a 7 day bod test performed on a sample from a raw wastewater sample was 200 mg/l. the base e bod rate constant determined from previous studies was estimated to be 0.1d-1. determine the 5 day bod of the sample.? (2 pts) a. 121 mg/l b. 156 mg/l c. 241 mg/l d. 397 mg/l