bailey, inc., is considering buying a new gang punch that would allow them to produce circuit boards more efficiently. the punch has a first cost of $80,000 and a useful life of 15 years. at the end of its useful life, the punch has no salvage value. labor costs would increase $2,000 per year using the gang punch, but raw material costs would decrease $10,500 per year. marr is 5%/year. part a what is the internal rate of return of this investment