弱问 sale tax 问题 多谢

secretnancy

24.   1952-!-item-!-187;#058&002488
At a certain restaurant, if each hamburger costs the same amount, what is the cost, excluding sales tax, of 1 hamburger?
(1)  The total cost, including a 6 percent sales tax, is $4.77 for 3 hamburgers.
(2)  The total cost, including a 6 percent sales tax, is less than $6.50 for 4 hamburgers.
答案为A.

【思路】
設hamburger成本=h, 問 h=?
(1) 3h(0.06) = 4.77,可得h,充分
(2) 4h(0.06) < 6.50 ,不知h多少,不充分

27. 2260-!-item-!-187;#058&002626
What is the price for a certain meal listed on a menu?
(1)  The total paid for the meal, sales tax, and gratuity is $10.84.
(2) The sales tax on food is 6 percent.
-------------------------------------------------------------------------------------------------------------
【答案】E
【思路】設meal price=m
(1) 設tax=t, gratuity=g, m+t+g=10.84 ,無法得知m,不充分
(2) t=0.6m, 無法得知m,不充分
(1)+(2) 兩個式子還是不知m等於多少,不充分


我现在不明白 sale tax 到底是百分之多少的谁？ 是指占price的百分比还是占cost的百分比
第一题
(1) 3h(0.06) = 4.77,可得h,充分
这个等式是什么意思呢？

多谢

wenjie87

24.   1952-!-item-!-187;#058&002488
At a certain restaurant, if each hamburger costs the same amount, what is the cost, excluding sales tax, of 1 hamburger?
(1)  The total cost, including a 6 percent sales tax, is $4.77 for 3 hamburgers.
(2)  The total cost, including a 6 percent sales tax, is less than $6.50 for 4 hamburgers.
答案为A.

【思路】
設hamburger成本=h, 問 h=?
(1) 3h(0.06) = 4.77,可得h,充分
(2) 4h(0.06) < 6.50 ,不知h多少,不充分

27. 2260-!-item-!-187;#058&002626
What is the price for a certain meal listed on a menu?
(1)  The total paid for the meal, sales tax, and gratuity is $10.84.
(2) The sales tax on food is 6 percent.
-------------------------------------------------------------------------------------------------------------
【答案】E
【思路】設meal price=m
(1) 設tax=t, gratuity=g, m+t+g=10.84 ,無法得知m,不充分
(2) t=0.6m, 無法得知m,不充分
(1)+(2) 兩個式子還是不知m等於多少,不充分


我现在不明白 sale tax 到底是百分之多少的谁？ 是指占price的百分比还是占cost的百分比
第一题
(1) 3h(0.06) = 4.77,可得h,充分
这个等式是什么意思呢？

多谢

-- by 会员 secretnancy (2010/8/29 10:33:55)

sales tax是占成本的6%
我觉得第一个应该是  3*h*（1+6%）=4.77

secretnancy

24.   1952-!-item-!-187;#058&002488
At a certain restaurant, if each hamburger costs the same amount, what is the cost, excluding sales tax, of 1 hamburger?
(1)  The total cost, including a 6 percent sales tax, is $4.77 for 3 hamburgers.
(2)  The total cost, including a 6 percent sales tax, is less than $6.50 for 4 hamburgers.
答案为A.

【思路】
設hamburger成本=h, 問 h=?
(1) 3h(0.06) = 4.77,可得h,充分
(2) 4h(0.06) < 6.50 ,不知h多少,不充分

27. 2260-!-item-!-187;#058&002626
What is the price for a certain meal listed on a menu?
(1)  The total paid for the meal, sales tax, and gratuity is $10.84.
(2) The sales tax on food is 6 percent.
-------------------------------------------------------------------------------------------------------------
【答案】E
【思路】設meal price=m
(1) 設tax=t, gratuity=g, m+t+g=10.84 ,無法得知m,不充分
(2) t=0.6m, 無法得知m,不充分
(1)+(2) 兩個式子還是不知m等於多少,不充分


我现在不明白 sale tax 到底是百分之多少的谁？ 是指占price的百分比还是占cost的百分比
第一题
(1) 3h(0.06) = 4.77,可得h,充分
这个等式是什么意思呢？

多谢

-- by 会员 secretnancy (2010/8/29 10:33:55)

sales tax是占成本的6%
我觉得第一个应该是  3*h*（1+6%）=4.77

-- by 会员 wenjie87 (2010/8/29 10:50:38)

这个是ＰＥＲＰ给出的答案的思路　不是我的思路
是不是答案错了？