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(5 pts) 1. A new bottle-capping machine costs $45 000, including $5000 for installation. The machine is expected to have a useful life of eight years with no salvage value at that time (assume straight-line depreciation). Operating and maintenance costs are expected to be $3000 for the first year, increasing by $1000 each year thereafter. Interest is 12 percent. What is the economic life of the bottle capper