[計量] (ds) pp1-59和192
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
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....
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