Horizon Rig Engineering must build one jack-up rig leg that was recently destroyed by a hurricane. If made of normal steel, the jack-up leg will cost $30,000 to construct and should last 15 years. Corrosion maintenance will cost $1,000 per year and $5000 salvage value at the end of its life. If corrosion resistant steel is used, the jack-up leg will cost $40,000 to build and the annual corrosion maintenance cost will be reduced to $250 per year, with a life of 20 years and zero salvage value. Determine which option is the best if Horizon Rig Engineering requires MARR of 9% per year on its capital projects