5. Karen paid a $10 commission to purchase the Sea Tech shares and the commission dropped to $7 when the shares were sold. What was the total return of Karen's investment when commissions are included? (Hint: Total return with commissions = (Money received from stock sale - money paid for stock purchase + dividends received all commissions paid) / Money paid for stock purchase.) a. 12.1% b. 12.33%. c. 12.5% d. 12.67%