Q3: The following table gives the operation cost, maintenance cost and salvage value at the end of every year of a machine whose purchase value is 25,000$. Find the economic life of the machine assuming interest rate, i = 15%. End of Year (n) Cost operation at the end of year ($) 3000 4000 5000 1 2 3 4 5 6 7 8 9 10 6000 7000 8000 9000 10000 11000 12000 Maintenance cost at the end of year ($) 300 400 500 600 700 800 900 1000 1100 1200 Salvage value ate end of the year ($) 9000 8000 7000 6000 5000 4000 3000 2000 1000 500