Step 1: Find the heart rate
One cardiac cycle (atrial systole, ventricular systole and diastole) takes 1.2 seconds
To find the number of cardiac cycles completed in a minute, multiply by 60
60 x 1.2 = 72 bpm
Step 2: Insert relevant figures into the equation
Cardiac output = heart rate x stroke volume
Cardiac output = 72 x 75 = 5,400 cm3
Cardiac output = 5.40 dm3