Consider the comparison between alternatives A and B. Using present worth method of analysis, and at an interest rate of 10% per year, the values of n that you should use in the uniform series factors to make a correct comparison are:

	A	B
First Cost	500,000	900,000
Annual Operating Cost	100,000	40,000
Salvage Value	130,000	150,000
Life	3 years	6 years