The percentage of functional haemoglobin combined with oxygen is expressed as ______
(a) (concentration of oxyhaemoglobin/{concentration of oxyhaemoglobin+ concentration of deoxyhaemoglobin})*100
(b) (concentration of deoxyhaemoglobin/{concentration of oxyhaemoglobin+ concentration of deoxyhaemoglobin})*100
(c) ({concentration of oxyhaemoglobin+ concentration of deoxyhaemoglobin}/concentration of deoxyhaemoglobin)*100
(d) ({concentration of oxyhaemoglobin+ concentration of deoxyhaemoglobin}/concentration of oxyhaemoglobin)*100