The document explains how to calculate Internal Rate of Return (IRR) and Net Present Value (NPV) using Microsoft Excel functions, detailing their syntax and parameters. It highlights essential considerations in capital budgeting, such as cash flows versus accounting profits, financing costs, working capital, and cash flow estimation methods. Additionally, real-world examples, including a case study on Speedo's LZR-2 swimsuit project, illustrate these concepts in a practical context.