Answer:
Note: The organized question is attached
Description of each transaction
1. Merchandise purchased on account as a cost of $39,200, which is $40,000 less 2% discount of $800
2. Paid fright charge of $450
3. An allowance or return of merchandise was granted by the seller, $4,900, which is an invoice amount of $5,000 less 2% discount of $100
4. The balance due of $34,300 ($39,200 - $4,900) was paid within the discount period