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4. Determine if the defender should be replaced or keep for its useful life. Defender First Cost Salvage Value Machine A Php. 45,000 Php. 14,000 12 Machine B Php. 30,000 Php. 8,000 8 Life in years 5 Php. 8,500 Php. 4,900 Php. 3,500 Annual Operating Cost Trade-in Value of the defender Php. 13,000 Php. 9,000