推 PINKENVI:非常感謝....^____^ 06/16 16:35
※ 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
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