North Face Mining Inc. ("North Face" for short), is considering constructing a refinery in a remote wilderness area to process nickel ore from its current mining operations. North Face anticipates that the refinery will take a year to build and cost Php 100 million upfront. Once built, it will increase North Face's nickel supply within the region, with estimated annual revenues of Php 15 million in 25 years. After 25 years, the nickel mine will run out of ore, and you expect to pay Php 250 million to shut down the refinery and restore the area to its former state. This project assumes a cost of capital of 14% (a) Determine the Net Present Value (NPV) of this project. (b) Determine whether the IRR rule is reliable for this project