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2．某公司每年需要甲材料10000件，每次订货成本为400元，每件材料的年储存成本为2元，该种材料的采购价为20元/件。假设一次订货量在4000件以上可获2%的折扣，在5000件以上可获5%的折扣。
要求：计算经济进货批量。

答案

参考答案：

若不享受折扣时，最佳进货批量为：

存货相关成本总额

＝10000×20+(10000÷2000)×400+(2000÷2)×2＝204000(元)

若享受折扣，不同情况下存货成本总额分别计算如下；

一次订货量为4000件时：

存货相关成本总额

＝10000×20×(1-2%)+(10000÷4000)×400+(4000÷2)×2＝201000(元)

一次订货量为5000件时：

存货相关成本总额

＝10000×20×(1-5%)+(10000÷5000)×400+(5000÷2)×2=195800(元)

所以，此时经济进货批量为5000件。

单项选择题

When I was looking for a Christmas present for my daughter in a toy store, a nicely dressed little girl, with some money in her little hand, was looking at some beautiful dolls. When she saw a doll she liked, she would ask her father if she had enough money. He usually said yes.
At the same time, a boy, with old and small clothes, was looking at some video games. He, too, had money in his hand, but it looked no more than five dollars. Each time he picked up one of the video games and looked at his father, he shook his head.
The little girl had chosen her doll, a very beautiful one. However, she noticed the boy and his father. She saw the boy give up a video game with disappointment and walk to another corner of the store.
The little girl put her doll back to the shelf and ran over to the video game. After she talked to her father, she paid for the video game and whispered(耳语) to the shop assistant.
So the boy got the video game that he wanted for free—he was told it was a prize from the store. He smiled happily, although he felt it was so incredible. The girl saw all this happen. She smiled, too.
When I walked out of the store to my car, I heard the father ask his daughter why she had done that. I would never forget their short talk. " Daddy, didn’t Grandma want me to buy something that would make me happy"
He said, "Of course, she did. "
"Well, I just did!" With that, the little girl started skipping towards their car happily.

Which of the following is TRUE according to the story

A．The little girl was kind and helpful.
B．The video game was a prize from the store.
C．The writer paid for the video game for the boy.
D．The boy bought the video game himself from the store.
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单项选择题

有单独使用期限限制的机件是指（）。

A.寿命件

B.期限件

C.限制件

D.周期件
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