4) Machine A costs $35,000, lasts 3 years and has a salvage value of $7,500. Machine B costs $25,000, lasts 2 years and has a salvage value of $3,500. The machines can be purchased at the same price with the same salvage value in the future, and are needed for 60 years. Which machine would you purchase and why? Interest is 8% annual rate, compounded annually.