A machine costs $20,000 and has a 5-year useful life. At the end of the 5 years, it can be sold for.
A means consumes $20,000 and has a 5-year beneficial history. At the end of the 5 years, it can be sold for $4000. If annual curiosity-behalf is 8%, compounded semiannually, what is the equipollent equal annual consume of the machine? (An straight key is expected.)