In attempt to raise the concentration of a drug in the system to the minimum effective concentration quickly, sometimes doctors give a patient a loading dose, which is an initial dosage that is much higher than the maintenance dosage. A loading dose for Dilantin is three doses-400 mg, 300 mg, and 300 mg 2 h apart. Twenty-four hours after the loading dose, normal dosage of 100 mg every 8 h begins. Develop a model for this dosage regime.