Consider following data for a defender asset. What is the appropriate replacement analysis technique to -compare this

Question:

Consider following data for a defender asset. What is the appropriate replacement analysis technique to -compare this asset against a competing challenger? How is this method used? That is, what comparison is made, and how do we choose?
BTCF in Year n
Year, n (marginal costs)
1...................................- $2000
2...................................- 1750
3...................................- 1500
4...................................- 1250
5...................................- 1000
6...................................- 1000
7...................................- 1500
8...................................- 1500
9...................................- 2000
10...................................- 3000