A patient has normal values of 120/80 mm Hg blood pressure (ie, 120 and 80 mmHg for systolic and diastolic pressure, respectively), a heart beat rate (HR) of 60 beats per minute (bpm) and a cardiac output of 6 liter per minute. If the patients blood pressure suddenly rises to 150/90 mmHg, what is the new stroke volume? You may assume compliance of the aorta does not change. Cardiac output = stroke volume * HR.