Final answer:
Alexander made $585 in commission last week. In 2011, he made $30,420 in commission.
Step-by-step explanation:
To calculate Alexander's commission, we can multiply the value of the stocks he sold by the commission rate.
$4,500 imes 0.13 = $585
Therefore, Alexander made $585 in commission last week.
To calculate how much he made in commission in 2011, we need to know the number of weeks in 2011. Assuming there are 52 weeks in a year, we can multiply Alexander's weekly commission by the number of weeks in 2011:
$585 imes 52 = $30,420