Imagine you purchased 75 shares of this stock on day 1 and sold all of those shares on day 3. what is the return on your investment? show your work.
day 1

75 shares x price = 13,179

day 3

75 shares x price = 13,293

return on investment = (final value - initial value) / initial value

if you had sold all of the stock on day 5 instead of day 3, what is the difference between the return on your investment? show your work.
day 1

75 shares x price = 13,179

day 5

75 shares x price = 13,177.5

return on investment = (final value - initial value) / initial value

Day 1: 75 shares x price = 13,179 
price = 13,179 / 75 shares = 175.72 price per share

Day 3 : 75 shares x price = 13,293
price = 13,293 / 75 shares = 177.24 price per share

Return on Investment = (Final value - Initial value) / Initial value 
ROI = (13,293 - 13,179) / 13,179  = 0.00865 
0.00865 x 100% = 0.87%

If share is sold in Day 5 instead of Day 3.
Day 5 : 75 shares x price = 13,177.5
price = 13,177.50 / 75 shares = 175.70 per share

Return on Investment = (Final value - Initial value) / Initial value
ROI = (13,177.50 - 13,179) / 13,179 = -0.000113
-0.000113 x 100% = -0.011%

If I had sold my shares in Day 3, I would have gained positive ROI because price per share increased. 

If I had sold my shares in Day 5, I would have lost a bit because price per share decreased resulting to a negative ROI

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