This article covers various topics related to business finance such as computation of net cash inflow, determination of internal rate of return, calculation of average operating cycle, current and acid test ratio, theoretical ex right price of an ordinary share in Mainsbury PLC, and financial ratios for Crusher PLC. The article provides a detailed analysis of the financial viability of investing in a project and compares different methods that can be used to account for risk while analyzing the viability of a project. It also includes calculations and interpretations of various financial ratios for Crusher PLC.