The following data were obtained from a man weighing 70 kg • Aorta oxygen (O2) content = 20.0 vol% • Femoral vein O2 content = 16 vol% • Coronary sinus O2 content = 10 vol% • Pulmonary artery O2 content = 15 vol% • Total body O2 consumption = 400 ml/min what is the cardiac output of this man?