The asset side of the 2013 balance sheet for BNSF Corporation is below. The company reported total revenues of $22,014 million in 2013 and $20,835 million in 2012.

Required: a. What proportion of gross accounts receivable does BNSF record as an allowance each year? Interpret the year-over-year change in the ratio. a. Calculate the common-sized accounts receivable, net, for 2013 and 2012. c. Compute the accounts receivable turnover for 2013 and 2012. At December 31, 2011, accounts and other receivables, gross were $1,189 million. d. Does the accounts receivable turnover you calculated above, seem reasonable for a railway company? Explain.

Please answer all parts of the question, math and written essay. Thank You!