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Cumulative Comprehension Problem: Echo Systems (This comprchensive problem starts in this chapter and contimes in Chapters 3, 4, and 5. Because of its length, this problem is mast casily solved (fyou use the Working Papers th that accompany this tert.) On October 1,2017, Mary Graham organized a computer service company called Echo Systems. Echo is organized as a sole proprietorship and will provide consulting services, computer system installations, and custom program development. Graham has adopted the calendar year for reporting, and expects to prepare the company's first set of financial statements as of December 31, 2017. The initial chart of accounts for the accounting system includes these iterns: PART A: CHECK FIGURES: 4 . Total Dr=$159,4505. Profit =$8,920; Total assets =$145,720