A company's stock price decreased by 20% on Monday, 50% on Tuesday, 3% on Wednesday, and increased by 50% on Thursday and 20% on Friday. What can be concluded about the stock price at the end of Friday compared to the beginning of Monday?
Solution
Let's take the sock price on Monday start to be 100
Using the multiplication factor for all the increases and decreases through the week, we get:
$$100\times\ \frac{4}{5}\times\ \frac{1}{2}\times\ 0.97\times\ \frac{3}{2}\times\ \frac{6}{5}$$
$$97\times\ \frac{18}{25}$$
This would be less than 97.
Hence, Option A would be the correct answer.
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