/ 20.0 points A construction company bought a 180,000 metric ton earth sifter at a cost of $65,000. The company expects to keep the equipment a maximum of 3 years. Its operating cost is expected to be $50,000 for the first year, with costs increasing by $10,000 per year. The salvage value is estimated to be $30,000 for years 1 and 2 and $20,000 for years 3. At an interest rate of 10% per year, determine the economic service life and the associated equivalent annual cost of the sifter