(4). Gifted Heart Construction Company obtained a loan from Bay Area Bank at an interest rate of 10% to purchase an excavator for $550,000. The tires will be replaced at a cost of $80,000 and the engine would be refurbished at a cost of $50,000 in year 5 . The salvage value of the excavator after 10 years of use in construction projects would be $75,000. (a). What is the annual cost of owning the excavator? (b). What is the future cost 6 years from now