## Interest - Very Difficult!!

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### Interest - Very Difficult!!

by Tame the CAT » Fri Apr 27, 2007 4:40 am
An investor purchased a share of non-dividend-paying stock for p dollars on Monday. For a certain number of days, the value of the share increased by r percent per day. After this period of constant increase, the value of the share decreased the next day by q dollars and the investor decided to sell the share at the end of that day for v dollars, which was the value of the share at that time. How many working days after the investor bought the share was the share sold, if ?

A. Two working days later.
B. Three working days later.
C. Four working days later.
D. Five working days later.
E. Six working days later.

I'll post solutions later.

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by parore26 » Fri Apr 27, 2007 6:33 am
Hi,
Is there any other information after the if? I think the question is incomplete. So far though I have this equation

p(1+r)^x-q = v. We want to find x but there is too much information missing.

Hope this helps.

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by Tame the CAT » Fri Apr 27, 2007 8:11 am
sorry.

if r = 100*SQROOT{[(v+q)/p]-1}

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