求助一个数学问题， OG2017 251题

AlexSG

251. If the total price of n equally priced shares of a certain stock was $12,000, what was
the price per share of the stock?
1. If the price per share of the stock had been $1 more, the total price of the n
shares would have been $300 more.
2. If the price per share of the stock had been $2 less, the total price of the n shares
would have been 5 percent less.

答案如下：

Arithmetic Arithmetic operations; Percents
Since the price per share of the stock can be expressed as determining the
value of n is sufficient to answer this question.
1. A per share increase of $1 and a total increase of $300 for n shares of stock
mean together that n($1) = $300. It follows that n = 300; SUFFICIENT.
2. If the price of each of the n shares had been reduced by $2, the total reduction in
price would have been 5 percent less or 0.05($12,000). The equation 2n =
0.05($12,000) expresses this relationship. The value of n can be determined to
be 300 from this equation; SUFFICIENT.

哪位大神给解释一下，题目在问什么？

咖啡印象

非大神，个人感觉题目问的是：

如果n股等价的某股票的总价格是12000美元，那么每股的价格是多少？