Re: [計量] 請問4題計量問題^^

看板GRE (GRE入學考試)作者collegeman (通體舒暢)時間17年前 (2008/09/26 13:08)推噓2(2推 0噓 5→)

留言7則, 2人參與討論串2/2 (看更多)

: 1 which of the following equals he reciprocal of x- 1/y, : where x-1/y ≠ 0? : a) 1/x – y : b) –(y/x) : c) y/(x-1) : d) x/(xy-1) : e) y/(xy-1) x-(1/y) 的反比就是 1/[x-(1/y)] = 1/[(xy-1)/y] = y/(xy-1) Ans:(E) : 2.tickets for all but 100 seats in a 10000- seat stadium were sold. : Of the tickets sold, 20 percent were sold at half price and : the remaining tickets were sold at the full price of 2$. : what was the total revenue from ticket sales? : (我有點看不懂題目的意思@@ 希望有人可以解說一下感溫) : A)$ 15840 : B)$ 17820 : C)$ 18000 : D)$ 19800 : E)$ 21780 在有10,000個座位的體育館中,除了100個座位沒進行售票以外, 剩下的座位中,有20%是以原價的一半售出,其餘的則是以原價2元售出。請問售票所得共多少? (10000-100)*0.2*(2*1/2) + (10000-100)*(1-0.2)*2 = (10000-100)*(0.2*1+0.8*2) = 9900*1.8 = 17820 Ans:(B) : 3.A bank customers borrowed $10000, but received y dollars less than this : due to discounting. If there was a separate $25 service charge, then, : in terms of y, the service charge was what fraction of the amount that the : customer received? : A) 25/ 10000-y : B) 25/10000-25y : C) 25y/10000-y : D) y-25 /10000-y : E) 25/10000-(Y-25) 這題我不太確定該如何做, 但是答案應該是(A)or(E)。因為選項中有25y的一定不對,所以可以劃掉(B)(C)。再來題幹是問 the service charge，所以分子一定是25，所以再劃掉(D)。不是的話就冏了 ^^" 關鍵在於 discounting 包不包括 the service charge? 我不熟悉金融用語 @@ : 4. In country X a returning tourist may import goods with a total value of : $500 or less tax free, but must pay an 8 percent tax on the portion of : the total value in excess of $500. What tax must be paid by a returning : tourist who imports goods with value of $ 730? : A)$ 58.4 B) $40 C) $24.6 D) $18.4 E) $16 (730-500)*0.08 = 18.4 Ans:(D) -- disabuse是解除錯誤(error), 解除疑惑應該是clarify -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.109.19.239 ※ 編輯: collegeman 來自: 140.109.19.239 (09/26 13:26)