4. builtrite d is considering the purchase of a new machine for $500,000 which would require a $5000 installation charge. employees would need to go through a brief training session to operate the machine properly which would cost $25,000. in addition, an increase in net working capital of $30,000 would be required. the machine has an expected life of 10 years and due to efficiencies, labor costs are expected to decrease $150,000 annually (before depreciation and taxes). assume straight-line depreciation, a 34% marginal tax rate and a cost of capital of 15%. should builtrite d purchase the machine?