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chetan2u
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chetan2u
­The graph below gives the fluctuation in the price of a share of Prince Automobiles over two days.
Attachment:
Prince Automobiles shares.png

An Automated Trading System A buys shares of Prince Automobiles at a certain time on Day 1 and sells the entire quantity exactly one hour after that time on Day 2.

Choose the most appropriate option from the dropdown menu below that would make the statement true based on the information provided above.

ATS A should buy the shares at  on Day 1 and sell the shares at  on Day 2 to maximize the profit per share.
­
­
We have to look for the time period where the blue line, that is day 2, is more than the yellow line, that is day 1, an hour prior.

Such times are
0900h and 1000h: Yellow is at 120 at 0900h and Blue is at 150 at 1000h, so a profit of $30.
1300h and 1400h: Yellow is at 130 at 1300h and Blue is at 150 at 1400h, so a profit of $20.
1400h and 1500h: Yellow is at 150 at 1400h and Blue is at 160 at 1500h, so a profit of $10.

Hence, the answer is 0900h and 1000h.
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Interesting question, it is not difficult, I got it right in 1:57.

I think the color and the day 1 versus day 2 threw me off while reading at first I thought Day 1 was blue......interesting setup for the graph, I like it.
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Need to compare between an hour of D1 and the next hour of D2

                           D1         D2

9h-D1/10h-D2      120        150
10h-D1/11h-D2     110        110  => same
11h-D1/12h-D2     150        120  => decrease
12h-D1/13h-D2     140        140  => same
13h-D1/14h-D2     130        150
14h-D1/15h-D2     150        160

9h-D1/10h-D2 saw the highest percent increase
 
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IMPROVED VERSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/i29-445720.html