To clarify the invoicing setup, we suggest including a dedicated line for the deposit specifying the date, percentage of the total, and the exact amount, followed by a separate line for credit card fees, which can be proportionally split between the deposit and the final payment. Once the deposit and any applicable credit card fees are paid, the invoice should show an updated balance clearly, avoiding confusion between the deposit invoice and the final invoice. This approach ensures transparency and easy tracking of payments, much like how tools such as https://meinprozentrechner.com/aufgaben-zur-prozentrechnung-einfach-erklaert-mit-beispielen/ help users calculate percentages accurately and understand how partial amounts contribute to totals.