Final answer:
To find Alanna's commission rate, we can use the formula Commission = (Commission Rate / 100) * Total Trade Value. Substituting the given values, we find that Alanna's commission rate is 5%.
Step-by-step explanation:
To find the percent of commission, we can use the formula:
Commission = (Commission Rate / 100) * Total Trade Value
Given that Alanna received $1,050 for trades totaling $21,000, we can substitute the values into the formula:
$1,050 = (Commission Rate / 100) * $21,000
Multiplying both sides of the equation by 100, we get:
Commission Rate = ($1,050 * 100) / $21,000 = 5%
Therefore, Alanna's commission rate is 5%.