prep 2-180

Kath1985 · 发表于 2010-7-7 10:20:42

180.19674-!-item-!-187;#058&012673

Bob invested $2,000 in fund A and $1,000 in fund B.Over the next two years, the money in fund A earned a total interest of 12 percent for the two years combined and the money in fund B earned 30 percent annual interest compounded annually.Two years after Bob made these investments, Bob's investment in fund A was worth how much more than his investment in fund B ?

(A) $500

(B) $550

(C) $600

(D) $650

(E) $700

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【答案】B

我的解讀是 AB兩基金用分別用12%、30%作4年的複利循環再用A四年後利息- B四年後利息
AB四年後利息為:
A 2000*{(1+0.12)^4-1}
B 1000*{(1+0.3)^4-1}

但為何PP解答是如此呢題目明明說是複利 compound ..... 怎麼會用單利計算呢
2000 * (1+0.12) = 2240
1000 * (1+0.3)^2 = 1690
2240 - 1690 = 550元

請問我錯在哪

LEDGIRL · 发表于 2010-7-7 19:11:03

the money in fund A earned a total interest of 12 percent for the two years combined

题目中已经把复利的因素考虑进去了

prep 2-180

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