A plece of equipment has a first cost of $170,000, a maximum useful ife of 7 years, and a market (salvage) value described by the relation S 120,000-15,000k, where k is the number of years since it was purchased. The salvage value cannot go below zero. The AOC series is estimated u year. Determine the economic service life and the respective AVW. sing AOC-60,000+ 8,000 k The interest rate is 11% per The economic service life isyearts) and the AW value is $