A Dentist Is Deciding Between Two X- Ray Machines for His

question 3

Short Answer

A dentist is deciding between two X- ray machines for his new office. Estimated costs for each machine are given below. $$\begin{array} { | l | l | l | } \hline \text { Machine } & \text { A } & \text { B } \\\hline \text { Installed cost } & \$ 50,000 & \$ 52,000 \\\hline \text { Annual maintenance } & \$ 1500 & \$ 1200 \\\text { cost } & & \\\hline \text { Market value at year } 10 & \$ 5750 & \$ 6250 \\\hline \text { Life, years } & 10 & 10 \\\hline\end{array}$$ Which machine should be recommended based on the annual worth method and an actual- dollar analysis? Use an inflation- free MARR of 14%, an inflation rate of 6.5% per year, and a study period of 10 years.

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Definitions:

End-Systolic Volume

The volume of blood in the ventricle of the heart immediately after contraction, before the heart fills again.

End-Diastolic Volume

The volume of blood in the ventricles at the end of diastole, right before the heart contracts.

End-Systolic Volume

The volume of blood left in the ventricle after contraction (systole) and before it begins to fill again.

Cardiac Output

The volume of blood the heart pumps through the circulatory system in one minute, a critical measure of heart function and efficiency.