Lucky dog technology, a consumer electronics manufacturer in good credit standing with marathon, wishes to place a merchandise order with marathon sales for $25,000 on credit. sales forwards the new order to accounting for pre-approval and requests a a $25,000 credit line increase. previous sales records show that lucky dog has a current balance due of $17,800 carried over from the past two months. accounting approves a total credit line of $33,500. sales is confused with accounting's response. as they expected lucky dog to receive a total credit line approval of $42,800.

required:
provide a detailed and plausible explanation for the difference between the $42,800 credit line approval that sales expected and the $33,500 credit line which accounting actually approved for luck dog.