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【单选题】
某造纸厂要在一年内生产1200张纸,每次生产相等的批量,每张纸的单位成本为 3 元,但每生产一批纸需要调整机器的费用为 80 元,在生产过程中,占用银行资金的利率为 5%,若一年中所需要费用等于一年所需机器调整的费用与占用资金利息的总和,问批量多大时,使得全年所需费用最小?A.
600
B.
800
C.
700
D.
500
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