Machine A costs 100,000. It generates 12,000 per year revenue and has a salvage value of 3. Machine A costs 100,000. it, 4000 at the end of 5 years. Machine B costs 120,000. It generates 10,000 per year revenue and has a salvage value of S000 at the end of 7 years. Interest rate is 6 %. Assume linear decrease in salvage value. Analyze this, system using shortest lifetime longest lifetime least common multiple lifetime. Assume replacement values are exactly repeatable (for sake of simplicity)