When a drug such as a pain killer or an antibiotic is introduced into thr body, the kidney work to eliminate the drug. Assume that after an hour, 20 percent of the drug in the body is eliminated. After another hour, 20 percent of the remaining drug is eliminated, and so on. If a person receives an injection of 600 mg of pain killer, how much of the drug will remain in the person body after three hours ? (Round to the nearest whole number as needed.)

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