SOLUTION: please help me with this question.. At the beginning of the day,the prices of stocks A and B are the same.At the end of the day,the price of stock A has increased by 1/10 of its o

Question 933366: please help me with this question..
At the beginning of the day,the prices of stocks A and B are the same.At the end of the day,the price of stock A has increased by 1/10 of its original price and the price of stock B has decreased by 1/10 of its original price .The new price of stock A is what fraction of the new price of stock B?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
At the beginning of the day, both stocks have a price of 10 in some currency.
(If there is no currency that will do that, I can invent one).
At the end of the day, the price of stock A is
,
while the rice of stock B is
,
so the new price of stock A, as a fraction of the new price of stock B, is

NOTE:
Solved as shown above, you can easily get to the answer,
which is a great advantage for timed tests where you do not need to "show your work".
If you need to show your work, and/or
if your teacher objects to the use of made-up currencies,
you can do the same calculations starting with
"Let be the price of either stock at the beginning of the day."
Then, the new price of stock A at the end of the day is
,
and the new price of stock B at the end of the day is
,
so the new price of stock A, as a fraction of the new price of stock B, is

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