Answer: d. The invoice amount is greater than $3,300 and less than $3,400.
Explanation:
The terms of the sale are FOB destination, 2/10, n/30. This means that company B will get a 2% discount if they pay in 10 days, if not, they will have to pay in 30 days.
The goods were sold at a list price of $4,200.
Company B returned $750 according to the Credit memo from Company A.
This reduces the transaction amount by that credit memo,
= 4,200 - 750
= $3,450
It is stated that Company B paid within the discount period which was 10 days so they get the discount for a total balance of,
= 3,450 * (1 - 2%)
= $3,381
The answer therefore is option D.