Hello, I need help with question 12, and can you please explain the way you found the answer? Thank you!

12) Tahoe Ski Company uses the perpetual inventory system and the gross method of accounting for purchases. The company had the following transactions during January: (Hint: it helps to use a T-account for the customer January 6: January 8: January 15: Purchased $4.000 of inventory. The seller's credit terms are 2/10, 1/30. Returned $200 worth of defective units and received full credit. Paid the amount due, less the returned items. Prepare journal entries to record each of the preceding transactions