1. Statement of the problem. FDN Trading sold merchandise on September 1, 2023 for 500000 less two successive trade discounts of 10% and 10% on terms 20% down, balance 2/20, n/90. The related freight was 10000 on terms FOB Destination, Prepaid. The customer returned goods amounting to 40000 and made a partial payment of 200000. The account was collected on September 21 and we are to compute the cash collected on that date. 2. Formula and important rules. For successive trade discounts use net price = list price times (1-d1) times (1-d2). The cash discount 2/20 means a 2% discount on the balance if paid within 20 days. FOB Destination, Prepaid means the seller pays freight and freight is not collected from the customer. 3. Compute net price after trade discounts. $500000(0.9)(0.9)=405000$. 4. Subtract returns to get net receivable. $405000-40000=365000$. 5. Identify payments made before September 21. The required 20% down was paid at sale and equals $0.20(405000)=81000$. The customer also made an additional partial payment of $200000$. Total cash paid before September 21 equals $81000+200000=281000$. 6. Compute remaining balance before cash discount. $365000-281000=84000$. 7. Apply the 2% cash discount because collection on September 21 is within the 20-day discount period. Discount on the balance = $0.02(84000)=1680$. 8. Compute cash collected on September 21. Cash collected on September 21 = $84000-1680=82320$. 9. Final answer. The final amount of cash collected on September 21 is 82320.