At one of the oil refining nganklan tools. 2, in a refined each time. Oil refining is one of the most refined, grade A, grade 3 unit 1 B and C grade unit is 1 unit for songklan at A grade of oil refining machines, B grade unit 1 has 4 units and grades C 5 oil refining unit to factory sends customers a 100 grade oil. Unit B grade C grade 150 units and 340 units of the plant must be aware of how many times a specific machine, it will have oil for each grade according to customers ' requirements and the least costly. If each expense for each computer is equal to 4,000 baht.
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