5.3% *6. A machine costing $150,000 has a useful life of eight years, after which time its estimated resale value will be $30,000. Annual running costs will be $6,000 for the first three years of use and $8,000 for each of the next five years. All running costs are payable on the last days of the year to which they relate Using a discount rate of 20% per annum, what is the equivalent annual cost( to the nearest $100 ) of using the machine if it were bought and replaced every eight years in perpetuity? $21,100 $34,000 $44,200 $46,600