Analyzing and Interpreting Income Disclosures Sales information for 'l'esla lnc. follows. Year Ended December 31 (S thousands) 2018 2017 2016 Automotive sales ......................... $17,631 ,52 $8,534,752 $5,589,007 Automotive leasing ........................ 883.461 1 ,106,548 761,759 Total automotive revenues ................ 18,514,983 9,641 ,300 6,350,766 Services and other ........................ 1,391,041 1,001,185 467,972 Total automotive & services and other segment revenue ...................... 19,906,024 10,642,485 6,818,738 Energy generation and storage segment revenue ....................... 1,555,244 1,116,266 131,394 Total revenues ......................... $21,461,268 $11,758,751 $7,000,132 Automotive sales revenue includes revenues related to sale of new Model S, Model X and Model 3 vehicles, including access to our Supercharger network, internet connectivity. Autopilot. full self-driving and over-the-air software updates. Automotive leasing revenue includes the amortization of revenue for Model S and Model X vehi- cles under direct lease agreements as well as those sold with resale value guarantees accounted for as operating leases under lease accounting. We do not yet offer leasing for Model 3 vehicles. Services and other revenue consists of non-warranty after-sales vehicle services, sales of used vehicles, sales of electric vehicle components and systems to other manufacturers, retail mer- chandise, and sales by our acquired subsidiaries to third party customers. Energy generation and storage revenues consists of the sale of solar energy systems and en- ergy storage systems to residential, small commercial, and large commercial and utility grade customers. Required a. Tesla reports several sources of revenue. How should revenue be recognized for each of these busi- ness activities? Explain. b. Compute the relative size of sales revenue from the four types of revenue Tesla discloses. (Hint: Scale each type of revenue by total revenue.) What observations can be made about the different sources of revenue? c. Compute the growth in sales revenaboth years from each of the four types of revenue. What do we observe