求救～～～～～快考了 不明啊～～～～～

ymw_86

DS1:
Martha bought an armchair and a coffee table at an auction and
sold both items at her store. her gross profit from the purchase and
sale of the armchair was what percent greater than her gross profit
from the purchase and sale of the cofee table.
1)Martha paid 10 percent more for the armchair than for the coffee table.
2)Martha sold the armchair for 20 percent more than she sold the coffee table.

DS2:
Each
employee on a certain task force is either a manager or a director.
What percent of the employees on the task force are directors?
1)The
average(arithmetic mean)salary of the managers on the task force is
$5,000 less than the average salary of all employees on the task force.

2)The average salary of the directors on the task force is 15,000
greaster than tha average salary of all employees on the task force.

[此贴子已经被作者于2008-11-11 10:08:31编辑过]

flutemama

DS1:
Martha bought an armchair and a coffee table at an auction and sold both items at her store. her gross profit from the purchase and sale of the armchair was what percent greater than her gross profit from the purchase and sale of the cofee table.
1)Martha paid 10 percent more for the armchair than for the coffee table.
2)Martha sold the armchair for 20 percent more than she sold the coffee table.
Gross Profit = Sale - COGS
Cogs即买入价 Sale即卖出价

设 armchair    买入价 x1 卖出价x2  则gross profit for armchair     x2-x1
设 coffeetable 买入价 y1 卖出价y2  则gross profit for coffeetable  y2-y1

条件1  x1/y1 = 11/10 
条件2  x2/y2 = 12/10
x2-x1/(y2-y1) = (5/6)x2- (10/11)x1所以选不出 so E

joywu1221

DS2： ans：C

M=manager; D=director

number of manager is a

number of director is b

condition 1:

(M1＋M2+...Ma)/a+500=(M1+..Ma+D1+...+Db)/(a+b)

condition 2:

(D1+...+Db)/b-1500=(M1+..Ma+D1+...+Db)/(a+b)

can get 500a=1500b

so b/(a+b)=25%

therefore C,both together can calculate

说实话，真考这题，我没把握对

[此贴子已经被作者于2008-11-11 16:21:37编辑过]

ymw_86

thx a lot！！！

joywu1221

呵呵，我18号晚上考。一起加油