Concord industry purchased $9,900 of merchandise on February 1, 2025, subject to a trade discount of 10% and with credit terms 3/15, n/60. It returned $2,900 (gross price before trade or cash discount) on February 4. The invoice was paid on February 13. Assuming that Concord uses the perpetual method for recording merchandise transactions, record the purchase, return, and payment using the gross method. b. assuming Concord uses the periodic method for recording merchandise, record the purchases, returns, and payment using the gross method