Introduction to Managerial Finance : DCF and Working Capital

Answer the question 1 and 2 with citation and reference NO PLAGIARISM.

1- DCF:

1-Although the mathematics of DCF looks so simple and compelling, the implementation of DCF technique becomes a minefield of problems. The problems can be either with estimating cash flows and discount rates. Identify one problem from each type and explain. 

2- WORKING CAPITAL:

We assumed that a firm would recover all of the working capital it invested in a project. Is this a reasonable assumption? When might it be not valid?