求解两道数学PS~~~请各位高手帮忙！谢谢~~

zlin0222 · 发表于 2010-8-3 15:32:39

1、 A parking garage rents parking spaces for $10 per week or $30 per month. How much does a person save in a year by renting by the month rather than by the week?
(A) $140
(B) $160
(C) $220
(D) $240
(E) $260

2、The market value of a certain machine decreased by 30 percent of its purchase price each year. If the machine was purchased in 1982 for its market value of $8,000, what was its market value two years later?(A) $8,000
(B) $5,600
(C) $3,200
(D) $2,400
(E) $800

(A) $8,000
(B) $5,600
(C) $3,200
(D) $2,400
(E) $800

zlin0222 · 发表于 2010-8-3 15:35:10

对了，答案分别是B和C

eflet222 · 发表于 2010-8-3 15:46:50

一年52周,所以是520-360=160
每年掉30%的购买价(不是掉年初值是掉原始购买价),所以2年一共掉了60%,8000*0.4=3200

anniebieb · 发表于 2010-8-3 15:50:03

第一题 365/7=52 52*10=520元 12*30=360 520-360=160

anniebieb · 发表于 2010-8-3 15:55:03

第二题 8000*0.3*2=4800
8000-4800=3200

zlin0222 · 发表于 2010-8-3 15:58:00

谢谢各位了！！我确实想错了。。

anniebieb · 发表于 2010-8-3 16:04:24

谢谢各位了！！我确实想错了。。

-- by 会员 zlin0222 (2010/8/3 15:58:00)

不客气！一起努力~

求解两道数学PS~请各位高手帮忙！谢谢

所属分类: GMAT考试

正在浏览此版块的会员 ()