Final answer:
To calculate Margaret's commission, multiply $584,000 by 0.15 to get $87,600. Therefore, Margaret's total commission last year was $87,600.
Step-by-step explanation:
The student's question involves calculating a sales commission, which is a basic math problem involving percentages. To find Margaret's total commission for the year, calculate 15% of $584,000. You can do this by multiplying $584,000 by 0.15 (which is the decimal equivalent of 15%).
Commission = 0.15 × $584,000 = $87,600
Therefore, the answer is option a) $87,600. This is the amount of commission Margaret earned last year.