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9. (5 points) Calculate PCB exposure (units of mg/kg-d) for someone who would ingest one meal (210 grams) of contaminated fish per week for50 years. The edible tissue of the fish would have an average concentration of 2.50 ppm. You can assume that the person weighs 70kg, their lifetime is 70 years, and that we are interested in carcinogenic risk. [Hints: 2.50 ppm equals 2.5 mg of PCBs per 1,000 g of edible fish tissue; convert the fish intake to an average daily intake rate.]

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