Re: [計量] (ds) pp1-59和192

看板GMAT (GMAT入學考試)作者childcathy (去海邊～～)時間16年前 (2008/06/16 16:31)推噓1(1推 0噓 0→)

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※ 引述《PINKENVI (非要考好不可!)》之銘言： : 59. : Ann deposited money into two new accounts, A and B. : Account A earns 5 percent simple annual interest and : account B earns 8 percent simple annual interest. : If there were no other transactions in the two accounts, : then the amount of interest that account B earned in the first year : was how many dollars greater than the amount of interest that : account A earned in the first year? : (1) Ann deposited $200 more in account B than in account A. : (2) The total amount of interest that the two accounts earned in the first year was $120. : ans:C : 請幫我看以下算法，我的認知應該是對的吧? : (1) A*0.05 ，另外一個是B=(200-A)*0.08 沒有方程式無法求得 : (2) 無法得知 : 則(1)+(2): A*0.05+(200-A)*0.08=120 可得沒錯但（1）的解釋好像是 B＝200＋A 加上第（2）就可以有第二個方程式 A*0.05+(200＋A)*0.08=120 所以C 選項可以選 : 192. : On a certain day, Tim invested $1,000 at 10 percent annual interest, : compounded annually, and Lana invested $2,000 at 5 percent annual interest, : compounded annually. The total amount of interest earned by Tim's investment : in the first 2 years was how much greater than the total amount of interest : earned by Lana's investment in the first 2 years? : (A) $5 : (B) $15 : (C) $50 : (D) $100 : (E) $105 : ans:A : 這題直接帶公式進去好像不太對..... : 謝謝各位幫忙.... 這題我會直接想成 T interest = (1000*110/100)*110/100 - 1000= 210 L interest = (2000*105/100)*105/100 - 2000= 205 所以相減為5 就OK摟 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.103.36