Answer: Option 'C' is correct.
Step-by-step explanation:
Since we have given that
Number of shares of eBay bought by Connor = 30
Cost of each share = $20.95
Number of shares he bought more = 20
Cost of each share = $26.75
Rate of charges of broker's commission =- 3% on each share
Selling price of each share = $35.25
According to question,
Total amount he paid to bought the shares

Amount he was charged for commison is given by

Total amount he paid including commission is given by

similarly, he sold his shares , amount he received ,

Again he was charged commission which is given by

Total amount he received on selling the shares is given by

After all of his transactions, Connor makes

Hence, he made $511.21.
Therefore, Option 'C' is correct.