The data for new and used machines are shown below: Used machine New machine Initial cost($) 15,000 40,000 Annual operating cost ($/year) 8,000 2,000 Salvage value ($) 5,000 10,000 Life (years) 3 6 Using an interest rate of 10% per year to compare the machines on the basis of a present worth hoones analysis, the present worth values to use are: PW used = $31,139, PW new - $37.461 PW used = $31.139. PW new = $43.066 PW used = $54.533, PW new = $43,066 PW used = $54.533, PW new - $37.461