An engineer must choose between two technically equivalent alternatives, A and B. Based upon the data given below and an interest rate of 9%, which alternative should be selected?

First Cost : Rs. 3,000 (A) and Rs. 6,000(B)

Annual Maintenance: Rs. 500 (A) and Rs. 300(B)

End of Useful Life Salvage Value: Rs. 700 (A) and Rs.1,000 (B)

Useful Life: 5 years (A) and 15 years (B)