a) the Net Present Value (NPV) and the Internal Rate of Return (IRR) Present your workings in full and show as a minimum the following: - Sales revenue per year - Gross profit per year - Operating profit per year - Net profit per year - Total net cash flows per year - Present Value of cash flows per year - NPV and IRR b) the Payback Period for each of the two bike models. Present your workings in full and show as a minimum the following: - Sales revenue per year - Gross profit per year - Operating profit per year - Net profit per year - Total net cash flows per year - Cumulative cash flows per year - PP in years and months