Final answer:
Based on the provided commission scales, for every $1,000 in sales, the commission increases by $300. To earn $3,200 in commission, Tony would theoretically need to make at least $11,000 in sales; however, this option is not available in the provided choices. Therefore, based on the available data, none of the options (a, b, c, d) are correct.
Step-by-step explanation:
If Tony wants to earn $3,200 in commission for a month, we need to find the total sales amount that would result in that commission. Looking at the provided reference information, we can see a pattern that allows us to determine the amount of sales required to earn a specific commission.
For instance, $1,000 in sales results in a $300 commission, $2,000 in sales results in a $600 commission, and so on. By observing the increments, we can deduce that for every $1,000 in sales, the commission increases by $300. Therefore, to earn a commission of $3,200, we would divide the desired commission by the rate per thousand dollars in sales (3200 / 300), which equals approximately 10.67. Since commission is earned on whole thousands, Tony would need to make at least $11,000 in sales.
However, none of the options provided (a, b, c, d) include $11,000, suggesting that either there is an error in the question or incomplete information. Based on the choices given and the pattern of commission to sales, none of the options will result in a $3,200 commission according to the data available. If the question intended to ask for a commission amount present in the options, then we would have to select the closest lower commission. If we are strictly answering based on the data provided, none of the choices are correct.