Xenon Electric is considering buying a new printed circuits tester that would cost $16,000. As a result of this deal, the company will be saving $3,000 per year due to expected quality improvements. The salvage value of the tester is estimated to be $2,000 after 8 years of service life. After-tax MARR of Xenon Electric is 10% and it is taxed at 45%. Tax rules in Xenon Electric country specify that capital allowance for industrial equipment is to be calculated using straight-line depreciation scheme, with a life of 7 years and a 0 salvage value. a) Based on after-tax present worth analysis, should this investment be made? b) How much is the approximate after-tax IRR (Internal Rate of Return) on this investment? c) Based on approximate after-tax IRR analysis, should this investment be made? d) Does the approximate after-tax IRR analysis always lead to the same decision of the accurate after-tax IRR analysis