The manager of a National Forest is about to undertake a reforestation project in a burned out area.The project will involve the following six activities: 
What is the estimated slack time for the path U-W-Z?
Definitions:
Cash Inflows
The total amount of money being transferred into a business, typically from operating, investing, and financing activities.
Required Rate of Return
The minimum annual percentage earned by an investment that will induce individuals or companies to put money into a particular security or project.
Internal Rate of Return
A financial metric used to estimate the profitability of potential investments, calculated as the discount rate that makes the net present value of all cash flows from a particular project equal to zero.
Cash Flows
The net amount of cash and cash equivalents being transferred into and out of a business.
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