Please help!

Western Coal. Inc. is considering an open-pit mine. The rights to mine on public land are expected to cost $25M, and development of the infrastructure will cost another $12M. The mine should produce a net revenue of $SM per year for 20 years. Then the mine is closed, S15M will be spent for reclamation. Western Coal uses an MARR of 15%. Using Excel Plot a cash flow diagram Calculate the present worth tor the project at 15% Calculate the rate-of-return for the project using the " irr " financial function Generate a table of "Present Worth vs. Interest" in 1% intervals between 0 Less-Than Or Equal To