[商管] [微積分] -有點不懂題目要求的是什麼~懇請大家幫忙一下

[joewusuper (阿吉)]

題目一: 這題不懂題目到底要我求什麼，也完全無法列式
　　　　麻煩大家幫忙一下。　
An investor buy one share of stock for 100.
If the share price change as follows
(measured relative to the prior day's price):
    Day 1  Up 30%
    Day 2  Down 15%
    Day 3  Unchanged
    Day 4  Chang r%
    Day 5  Down 10%
If the pattern of relative price movements observed
on the first 5 days is repeated indefinitely,
how will the price of the share of stock behave in the long run?

題目二：麻煩大家告訴我，用什麼觀念下去求比較快
A company has 120,000 to spend on the development and promotion
of a new product. The past experience indicates
that if x is spent on development and y is spent on promotion,
then X^(1/2)*Y^(3/2)/30,000*3^(3/2) items can be sold.
(a) To maximize the number of items sold,
    how much money should be spend on development.
(b) What is the maximum number of items can be sold?

感謝各位的解答囉!!
如果題目有不清楚我附上網址
http://www.acad.scu.edu.tw/1/entrance/98exam/DE/95.pdf
裡面的3.4題~

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