Richert Company's activity for the first three months of 2010 are as follows: 
Using the high-low method, how much is the cost per machine hour?
Definitions:
Pulmonary Semilunar Valve
A heart valve that is a semilunar valve. It is situated between the right ventricle and the pulmonary trunk.
Right Ventricle
The lower right chamber of the heart that receives deoxygenated blood from the right atrium and pumps it into the lungs via the pulmonary artery.
Pulmonary Semilunar Valve
A valve in the heart located between the right ventricle and the pulmonary artery, preventing backflow of blood into the heart.
Pulmonary Artery Trunk
The main vessel that carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.
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