Consider the following 6 decision making units A, B, C, D, E, F and the case summarized by the following table (2 outputs, 1 input). Identify efficient units using the graphical method. Which units are efficient, which units are the least efficient and why? Which unit is the least efficient?

Unit A Unit B Unit C UnitD UnitE Unit F input 1 10 30 40 80 100 5 output 1 30 60 120 80 500 20 output 2 50 150 40 320 200 10