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This is the most current version of the Pretst 4 (v.1).

Probem 8: Added  arrows to the Check to link the colums with the steps that are listed.

Problem 11. Changed the conclusion to clarify it:

Between these two alternatives the one with the higher rate of return is better. If the IRR is lower than the Cost of Capital the project still could be pursued because of its strategic value but not of its financial justification.