A company is considering installing a solar heating system in its manufacturing plant for space and hot water hearing. There are three possible alternatives as given in the Table below:

	A	B	C
Solar Collector Area	2,500 ft2	3,500ft2	4,500 ft2
Storage tank	1,500 gal	1,500 gal	3,000 gal
Installed Cost	$20,000	$25,000	$50,000
Maintenance Cost	$2,500	$2,000	$1,500
Annual savings	35%	60%	85%
Useful life	10 years	10 years	10 years
Salvage value	0	0	$5,000

Note that the possible energy savings is a function of the size of the solar system installed. It has been determined that the annual heating cost for the plant is worth about $10,000. Use the Present Worth method with i=0 to determine the best alternative.