Solar Tech Inc. must choose between two mutually exclusive projects: A and B$.$ Both have a $10\%$ required rate of return. Consider the following on projected cash flows: a$.$ If you apply the payback criterion, which investment will you choose? Why? $(5$ marks$)$ b$.$ If you apply the NPV criterion, which investment will you choose? Why? $(5$ marks$)$ c$.$ If you apply the profitability index criterion, which investment will you choose? Why? $(5$ marks$)$ d$.$ What is the internal rate of return for each project? $(5$ marks$)$ e$.$ At what required rate of return would management be indifferent as to which project to choose? $(5$ marks$)$ f$.$ Based on your answers to the questions above, which project will you finally choose? Why? $(5$ marks$)$