Final answer:
The company's stock had a percent gain of 30% when it increased from $20 a share to $26 a share.
Step-by-step explanation:
To calculate the percent gain on the company's stock, you should first determine the difference in the stock's price from the initial selling price to the selling price a month later. The initial price was $20 a share, and a month later it increased to $26 a share. This is an increase of $26 - $20 = $6 per share.
Next, you find the percent increase based on the original price by using the formula:
Percent Increase = (Increase in Value ÷ Original Value) x 100%
For this example, it would be:
Percent Increase = ($6 ÷ $20) x 100% = 0.3 x 100% = 30%
Therefore, the stock has a percent gain of 30%.