1 Discussion Board Question on Quantitative Analysis/Managers

Read Reading_13.pdf first, then please comment on the following questions.

This is discussion board question, so only 1-2 paragraph is enough.

Questions: Why is it important to know the internal rate of return and the hurdle rate?  What is the difference in cash flow and profit?  Why go to the trouble of determining the present value for any decision which flows into multi-periods?