The following data have been estimated for two feasible investments, A and B, for which revenues as well as costs are known and which have different lives. If the minimum attractive rate of return is 10%, show which feasible alternative is more desirable by using NPW method. What is the difference in the NPW _B -NPW_A assuming repeatability?

	A	B
Investment (first) cost	$3,500	$5,000
Annual revenue	1,900	2,500
Annual cost	645	1,383
Useful life (years)	4	8
Salvage value at end of useful	400	900

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