Eddie's Precision Machine Shop is insured for $700,000. The present yearly insurance premium is $1.00 per $100 of coverage. A sprinkler system with an estimated life of 20 years and no salvage value can be installed for $20,000. Annual maintenance costs for the sprinkler system are $400. If the sprinkler system is installed, the system must be included in the shop's value for insurance purposes, but the insurance premium will reduce to $0.40 per $100 of coverage. Eddie uses a MARR of 15 percent/year. What is the present worth of this investment? What is the decision rule for judging the attractiveness of investments based on present worth? Is the sprinkler system economically justified