On January 1, 2016, Terry’s Towing Service owned 4 tow trucks valued at $300,000. During 2016, Terry’s bought 2 new trucks for a total of $180,000. At the end of 2016, the market value of all of the firm’s trucks was $400,000. What was Terry’s gross investment? Calculate Terry’s depreciation and net investment.

The Bureau of Economic Analysis reported that the U.S. capital stock was $49.6 trillion at the end of 2012, $51.2 trillion at the end of 2013, and $53.6 trillion at the end of 2014. Depreciation in 2013 was $1.6 trillion, and gross investment during 2014 was $3.4 trillion.