The following pharmacokinetic parameters were determined following the oral administration of Drug A: Systemic clearance (CLS) = 9 L/hr Fraction excreted unchanged (fe) = 0 Bioavailability (F) = 45 % a) Showing all working and stating all assumptions, determine 

(i) the proportion of Drug A that is absorbed from the gastrointestinal tract (fg), and 

(ii) the proportion of Drug A that escapes first pass metabolism (fh)