Ryngaert Industries uses the NPV method to establish its capital budget, and it is now considering two mutually exclusive projects whose after-tax cash flows are shown below: 
If the required rate of return is below some rate, then Project L should be selected, whereas if the required rate of return is above that rate then Project S should be selected.What is the "crossover" rate at which the NPV profiles of these projects intersect?
Definitions:
Puffballs
Puffballs are a type of fungus belonging to the division Basidiomycota, characterized by their globe-shaped spore cases that release spores through an aperture when mature.
Bracket Fungi
Fungi that grow shelf-like on trees and logs, often forming tough, woody fruiting bodies.
Zoosporangium
Structure in which zoospores form.
Zoospore
A flagellated motile spore produced asexually by chytrids, certain algae, water molds, and other protists.
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