Answer:
$19636.36.
Explanation:
We are told that Dabney Washington is paid a weekly commission of 3.5% on sales of $6,500 or less.
Let us find 3.5% of 6500.



We are told that she gets 5.5% on sales in excess of $6,500 and last week Dabney's commission was $950. So let us subtract 227.5 from 950 to get the amount of commission, which Dabney got on sales in excess of 6500.

Now let us find the amount (x) such that 5.5% of that amount must be 722.5.



Now let us add 6500 and 13136.36 to get the total weekly sales.

Therefore, the total of Dabney's sales for week was $19636.36.