Neco Model Questions Vol1 2025 Commerce Question 6

A trader sells three products. Product A: unit price \(\text{₦}12{,}500\), quantity 8. Product B: unit price \(\text{₦}7{,}200\), quantity 15. Product C: unit price \(\text{₦}3{,}450\), quantity 20. The invoice gives a trade discount of \(12\%\) on the total of the three products. After the discount, a VAT of \(7.5\%\) is added. The buyer pays a down‑payment of \(30\%\) of the amount after VAT. The remaining balance is to be paid \(45\) days later, and the seller charges simple interest of \(1.8\%\) per month on the outstanding balance for the period it remains unpaid. What is the total amount the buyer must finally pay (down‑payment plus the amount due after interest), rounded to the nearest naira?