Final answer:
Marco's commission for the month is $500, which is calculated by multiplying the total sales amount, $10,000, by his commission rate of 5% (0.05 in decimal form).
Step-by-step explanation:
If Marco earns a 5% commission on total sales, and his total sales for the month are $10,000, you can calculate his commission by converting the percentage to a decimal and multiplying it by the total sales.
To convert 5% into a decimal, divide 5 by 100, which is 0.05. Then, multiply 0.05 by $10,000 to find the amount of commission Marco earns. This calculation would look like: 0.05 × $10,000 = $500. Therefore, Marco's commission is $500.