When a drug is given intravenously, the concentration of the drug in the blood is C_i(t) = 250e^-0.08t, for t ≥ 0. When the same drug is given orally, the concentration of the drug in the blood is C_o(t) = 200(e^-0.08t - e^-1.8t), for t ≥ 0. Compute the bioavailability of the drug.