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A company has the following information for the years ending December 31, 2017 and 2018 2017 2018 Gross investment in fixed assets ($ mil) $3.6 $3,6 Accumulated depreciation (Smil) 1.75 2.25 What is the average age and the average depreciable life of the company's fixed assets at the end of 2018? a. Average age: Average depreciable life 1.6 years 7.2 years b. Average age: Average depreciable life 1.6 years: 10.8 years Oc. Average age: Average depreciable life 4.5 years: 10.8 years d. Average age; Average depreciable life 4.5 years 7.2 years