Question: I am in Intro Algorithmic Design II and i need Help completing this also i need comment through program. P12.3 (Class name: InvoicePrinter) P12.3 Enhance

I am in Intro Algorithmic Design II and i need Help completing this also i need comment through program.

P12.3 (Class name: InvoicePrinter)

P12.3 Enhance the invoice-printing program by providing for two kinds of line items: One kind describes products that are purchased in certain numerical quantities (such as 3 toasters), another describes a fixed charge (such as shipping: $5.00). Hint: Use inheritance. Produce a UML diagram of your modified implementation.

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