4. A construction company has the option to purchase a new piece of equipment for a project and is considering 3 alternatives, as listed in the table below. Which option should they buy, assuming a MARR of 13% and linear depreciation of equipment? Model Initial Cost Economic Life AL | C $60,000 $70,000 $85,000 3 years 4 years 5 years Operating and maintenance costs $10,000 $8,000 $7,500