Michael is an Intemet service provider. On December 31, 2014, he bought an existing business with servers and a bulding worth $300,000 During 2015, he bought new servers for $500,000. The market value of his older servers fell by $100,000. Michaols gross investment during 2015 was & Michael's depreciation during 2015 was $ Michael's net investment during 2015 was S Michael's capital at the end of 2015 was $.