求助大神！！！！OG13-CR97

henrywang916

moonlightzty 发表于 2013-10-8 06:28
油价上涨省的不是更多么，打个比方，原来油价5块钱，可以省20%，就是省了1块，之后涨到10块，就是省了2 ...

“the cost savings between the total amount the asphalt plant actually paid for oil using its former burner during the last two years and the total amount it will pay for oil using the Hotco burner during the next two years.”
=> payment is cost saving (with this formula) = paid with former burner in past two years - paid with new bunner in coming two years = Price of past 2 yrs * oil amount used by old burner -  Price of next 2 yrs * oil amount used by new burner
so for answer D, a decrease in the demande of asphalt might decrease the oil amount used by new burner, which is a advantage; for answer E, the rising of price of oil will increase the price of next 2 yrs, which is a disadvantge.
This question tells us to answer the question based on the assumption it gave rather than our common sense.

bearhawk

假设使用老设备的话原来两年的耗油是2MT，   

bearhawk

假设使用老设备的话原来两年的耗油是2MT，  每吨的单价是200美圆,那么总耗油成本是$400,现在假设使用了新BURNER,耗油量下降至1MT,如果这时油价涨到了400美圆, 那么总成本 就变成了 $400,$400-$400=0  B就拿不到一分钱了,如果油价从200美圆涨到了300美圆,2*$200-1*300$=$100 Burner可以赚100美圆，如果没有涨价2*200-1*200=200美圆。

所以说这道题很容易被表面的东西所迷惑啊，关于D，我们可以看出来，计算过程中的两个变量一个是燃油消耗量，一个是油价，如果需求少了，耗油自然减少 ，如果油价不变化，自然赚的更多

zx199538

moonlightzty 发表于 2013-10-8 06:26
油价上涨省的不是更多么，打个比方，原来油价5块钱，可以省20%，就是省了1块，之后涨到10块，就是省了2块啊 ...

是不是过了太久了。。。
题目上说 payment是last two years 的油费付出-next two years 的邮费付出。
假如现在每台耗油10单位，last two year油价1块，则现在邮费10
不涨价 新机器每台耗油2单位，每台油费2，省8元则hotco赚8元
涨价  仍耗油2，油价2，每台油费4，省6元则赚6元。
等于赚的少了。
主要注意看题目中俩个时间点。

enyika2014

題目就不明白什麼意思。好難啊!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

enyika2014

Hotco will get = amount paid for oil in last 2 years - amount paid for oil in next 2 years

now suppose the plant used 100 liters of oil in last 2 years at a price of $2 per liter....which means the plant spent $200 on oil

the price of oil is steadily increasing

now suppose the plane used 70 liters of oils (because the burner is efficient) in next 2 years at a price of $2.30 per liter....which means the plant will spend $161 on oil

Hotco will get = 200 - 161 = $39 for its burner which will be disadvantageous for Hotco because of its plan.

frank0401

16楼和18楼的正解。纠结于D的同学是明显搞错了比较对象！
题目说的是未来两年与过去两年的用油量相比呀（between....during the last two years and...during the next two years)，不是未来两年用新机器和不用新机器的油量对比！
换句话说，过去两年的用油量已经是固定值了，那么未来两年用的油越少越好，不管是装了新机器节油，还是生产的少，总之用的油比前两年少就行，最好是一点油不用（一点不生产），那样和过去两年比用油费用的差距最大了。
这个题的OG解释非常清楚，一句话就把D否了。我们不用搞这么复杂的计算，明显把简单问题搞复杂了。（如果D改成了沥青的需求增加了，那才复杂了，但是GMAC不会出现两个同时削弱的选项来让你判断哪一个更能削弱，一定是只有一个可以削弱的选项）

summer0501

最初也错选D，后来想想 save=2年前油耗/件*2年前件数-2年后油耗/件*2年后件数，依据D项，2年后油耗和件数都下降，那么save 自然上升，所以D项是advantage

Jojolalala

“on installation, the plant will make an estimated payment, which will be adjusted after two years to equal the actual cost savings”（之前一直理解安装就估算，估算完了就给钱，所以实在觉得没有一个选项是对的，原来是我脑抽）觉得这句话对我的误导太大了，不造最后一句有什么作用...

现在的理解是：

油价没上涨，H预计能赚：2L x 100元（过去两年）— 1L x 100元= 100 元
油价上涨：2L X 100元（用过去两年的油价）— 1L x 150元 = 50元

然后油价上涨了，两年后按照该公式沥青厂来付钱了，H公司傻乎乎的比预计少赚了50元

maljiang

Mark一下！