use the pw method to select the better of the alternatives shown below. assume that the defender was installed five years ago and that its macrs(gds) property class is seven years. the after-tax MARR is 10% per year, and the effective income tax rate is 40%

Annual Expenses	Defender: Alternative A	Challenger: Alternative B
Labor	-$300,000	-$250,000
Material	-250,000	-100,000
Insurance & Propertey Taxes	4% of initial capital investment	NONE
Maintenance	-$8,000	NONE
Leasing cost	NONE	-$100,000

Definition of Alternatives:

0Alternative A: Retain an already owne machine (defender) in service for eigh more years.

Alternative B: Sell the defender and lease a new one (challenger) for eight years.

Alternative A (additional information)

Cost of defender five years ago = -$500,000

BV now (if kept) = $111,500

Estimated market value eight years from now = $50,000

Present MV = $150,000.