Final answer:
The maximum number of shares Mr. Brown can sell according to Rule 144 is 18,400 shares.
Step-by-step explanation:
In order to determine the maximum number of shares Mr. Brown can sell according to Rule 144, we need to calculate the volume limit. The volume limit is the greater of 1% of the outstanding shares or the average weekly trading volume over the last 4 weeks.
First, we calculate 1% of the outstanding shares: 1% of 1,840,000 shares is 18,400 shares.
Next, we calculate the average weekly trading volume over the last 4 weeks: (15,000 + 17,200 + 19,600 + 18,100) / 4 = 17,225 shares.
The maximum number of shares Mr. Brown can sell is the greater of the two calculations, which is 18,400 shares.
Therefore, the correct answer is c. 18,400.