The town of Drygulch has been flooding once per year for the last twenty years. Folks have pretty much accepted the damages it causes. You have analyzed the flood periodicity and monetary impact to the town and know that with an upgrade to the storm drain system there would be a yearly savings depending on the flow rate (gallons per hour) of a new drainage system. The town expects a 7% MARR on any public works project. All of the drainage systems below would have twenty years of useful life but the materials used can be recycled at the end of their life, remarkably giving the town back the same amount of funds that were originally needed for whatever system was chosen.

Flow Rate Options	Funds Needed	Yearly Savings	Incremental IRR	Challenger-Defender Decision
Do Nothing	$0	$0	N/A	N/A
50,000	$140,000	$15,400		Incremental IRR ____ MARR, therefore _________ wins
100,000	$280,000	$42,000		Incremental IRR ____ MARR, therefore ________ wins
150,000	$388,500	$50,400		Incremental IRR ____ MARR, therefore ________ wins
200,000	$525,000	$70,000		Incremental IRR ____ MARR, therefore ________ wins
250,000	$575,500	$78,500		Incremental IRR ____ MARR, therefore ________ wins
300,000	$700,000	$84,000		Incremental IRR ____ MARR, therefore ________ wins

a) In the above table, give the incremental IRR between each option and the current Defender option. <3 pts>

Reasoning/Work:

b) In the above table, answer the Challenger-Defender Decision using the format given. <6 pts>

For example, suppose that the 100kgph option wins until the incremental IRR of 200kgph option is calculated. Suppose it is found that the incremental IRR between the 200kgph option and the 100kgph option is 9.27%, then the Challenger-Defender Decision answer in the table for the 200kgph option would look like this:

Incremental IRR __>__ MARR, therefore ___200,000___ wins

c) Which drainage system would you recommend to the town of Drygulch?

Answer: <1 pts>

Reasoning/Work: