An engineering company is working in coal mining operation has installed an in shaft monitoring system for oxygen tank and gear readiness for emergencies. Based on maintanence patterns for previous systems, costs are minimal for the first few years, increase for a time period, and then level off. Mantancence costs are expected to be $180,000 in year 3, and increase by 6% per year through year 6 and remain constant thereafter for the expected 10 year life of this system. If imular systems will replace the current one, determine the perpetual equivalent annual maintance cost at i=10% per year.