A total of $60,000 was invested for one year. But of this amount earned simple annual interest at the rate of ~$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=\frac{3}{4}y$~
(2) The ratio of the amount that earned interest at the rate of ~$x$~percent per year to the amount that earned interest at the rate of ~$y$~ percent per year was 3 to 2.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
要搞清楚题目的未知数,首先并不知道60,000怎么分配,其次不知道x y 是多少percent,所以有四个未知数,单独条件肯定都不行
合在一起会发现知道x y 的比例+4080利息的分配,所以可以解出x
题目当时没看明白的是total interest earned by the $60,000 for "that year"当时做题以为这也是一个未知数,但仔细想想因为他是单利,所以不管累积了几年,interests "earned" 都是一样多的
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