继续prep上的一道数学完全是越做越晕的状态···泪奔啊····

xyqirene · 发表于 2010-9-11 13:16:52

A certain business produced x rakes each month form November through February and shipped x/2 rakes at the beginning of each month from March through October.The business paid no storage costs for the rakes from November through February, but it paid storage costs of $0.10 per rake each month from March through October for the rakes that had not been shipped.In terms of x, what was the total storage cost, in dollars, that the business paid for the rakes for the 12 months form November through October?

A.0.40x

B.1.20x

C.1.40x

D.1.60x

E.3.20x

答案 c

xyqirene · 发表于 2010-9-11 13:31:46

不能沉下去···· 在群里问了也没有人能解答出来··· 这是个撒子题哦····· 我怎么算都是A

benxu · 发表于 2010-9-11 14:18:44

The total number of item-per-month = (3.5x+0)*8/2=14x

Note that the shipment initiates in the beginning of each month, thus the item does not count for storage expense.

Hence the total storage cost = 14x*0.1=1.4x

samalex · 发表于 2010-9-11 14:51:06

楼上高明...

xyqirene · 发表于 2010-9-11 15:09:44

我用了另一个比较笨的方法做出来了···
刚看到你的解答····
我不懂那个3.5怎么来的···

疏浅 · 发表于 2010-9-14 17:09:05

我也是用的笨方法，同问3.5怎么出来的。

疏浅 · 发表于 2010-9-14 17:12:57

哦。刚发完就反应过来了。应该是一样的。是7/2,6/2,5/2,....0这个数列的求和。

ivymm0301 · 发表于 2010-9-14 17:26:59

march剩的rake是4X-0.5X=3.5X

继续prep上的一道数学完全是越做越晕的状态···泪奔啊····

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