Usfan company is interested in buying a computer with uncertain life' The following table shows its expected life and resale value:

Expected Life	Probability	Resale value
3 years	20%	$20,000
4 years	30%	$10,000
5 years	50%	$5,000

The computer will save the company $40,000 annually while it is running. Usfan will depreciate it fully on a straight-line basis in 3 years. The tax rate of Usfan is 30%, and the proper discount rate in this case is 12%. The cost of the computer is $90,000. Should Usfan buy it?