3 An injection molding machine has a first cost of $1,050,000 and a salvage value of $225,000 whenever the machine is sold. The yearly maintenance and operating costs are $235,000 for the first year, increasing $75,000 each year after that. The MARR is 10%. Show your complete work to determine the economic life of the machine. If the machine is kept for This number of years 1 EUAC would be 2 4 5 6 7