The graph shows the price per share in dollars of Helix Motors through

Question

https://gmatclub.com/gmat-focus-tests/resources/import/img/I29-43new.png 
 
The graph shows the price per share in dollars of Helix Motors throughout the day on Day 1 and Day 2. An investor purchased shares at one of the times indicated on the x-axis on Day 1 and sold all of them exactly one hour later on Day 2, resulting in the greatest possible dollar gain per share.

Select from each drop-down menu the option that creates the most accurate statement based on the information provided.

The investor sold the shares at  GRAPH_1_PLACEHOLDER  on Day 2, resulting in a percentage gain per share of  GRAPH_2_PLACEHOLDER .

Bunuel · Accepted Answer

Official Solution:

Drop-down 1: 
 
• Since the investor sold the shares exactly one hour later on Day 2, we are looking for the largest increase from a given time on Day 1 to one hour later on Day 2. From the graph, the biggest jump occurs between 1pm on Day 1 and 2pm on Day 2, from $125 to $160, giving a gain of $35 per share.
 
 Drop-down 2: 
 
• For the second dropdown, we calculate the percentage gain per share by dividing the dollar gain ($35) by the purchase price at 1pm ($125): 35/125 * 100 = 28%.

Correct answer:

Dropdown 1:  "2pm"

Dropdown 2:  "28%"

chetan2u · Answer

We have to compare blue dots with orange dots just one hour after that. The max difference between the two should be a contender for the right answer. 
The two sets are 11am - 12 pm and 1-2pm.

11am-12pm: Blue dot is at 125 while orange is at 150, so gain of 25 over 125.
1-2pm: Blue dot is at 125 while orange is at 160, so gain of 35 over 125
Surely 35 over 125 will give bigger % => 100×35/125 =28%

The drop-down are
1st : 2pm
2nd : 28%

APram · Answer

Compare the orange dots with the blue dots just one hour from blue dots.
Checking orange dots after blue dots which are higher are between
11pm to 12pm - $25 (buy at 125 and sold at 150)
12pm to 1pm - $20 (buy at 110 and sold at 130)
1pm to 2pm -$35 (buy at 125 and sold at 160)
4pm to 5pm -$20 (buy at 135 and sold at 155)

Clearly the highest dollar gain is between 1pm to 2pm
% gain = 35/125 *100 = 28%

iamchinu97 · Answer

But how do we know that we have to find the greatest possible "percent increase" ? I still did not get why 12pm where 20% gain happened is not an answer??

Bunuel · Answer

Because the question never asks for the  greatest percent increase . It asks for the  greatest dollar gain per share . Only dollars.

Your 12pm case gives a  $20 gain  (110 to 130).
But the 1pm to 2pm case gives a  $35 gain , which is larger.

The graph shows the price per share in dollars of Helix Motors through

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