Invoice Generator — illustrative example

INPUT
Invoice INV-104; two design hours at USD 80 per hour; payment due in 14 days; no tax instruction supplied.

RESULT
Design services: 2 × USD 80 = USD 160.
Subtotal: USD 160. Tax: confirm applicable treatment.
Do not issue a final total until tax treatment is confirmed.

REVIEW
An invoice needs traceable line items, a currency and the agreed payment terms. Treat tax and numbering rules as supplied requirements, and check totals before issuing it.

This is a teaching example, not a live execution record.