[計量] GWD一題數學
A total of $60,000 was invested for one year. Part of this amount earned
simple annual interest at the rate of x percent per year, and the rest earned
simple annual interest at the rate of y percent per year. If the total
interest earned by the $60,000 for that year was $4,080, what is the value of
x?
(1) x =3/4x
(2) The ratio of the amount that earned interest at the rate of x percent per
year to the amount that earned interest at the rate of y percent per year was
3 to 2.
這題答案是C 但我選E
兩部份投資的錢都不知道
只知道X和Y的關係怎麼湊得出X是多少?
假設第一部份投資A (1+x%)A+(1+y%)(60,000-A)=4080
根據1或2或1和2都沒辦法求出X吧?
這題寫過兩次 第一次以為答案錯 第二次又出現 所以有點懷疑
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