P5-53. Interpreting Accounts Receivable and Related Footnote Disclosure Following is the current asset section from the W.W. Grainger Inc. balance sheet As of December 31 ($ 000s) 2015 2014 2013 Cash and cash equivalents . . . . . . . .. . . . . . . . . . ..$ 290,136 $226,644 $430,644 Accounts receivable (less allowances for doubtful accounts of $22,288, $22,121 and $20,096 1,209,641 1,172,924 1,101,656 102,669 61,387 47,529 85,670 115.331 75,819 15,315 $3,048,642 $2,967,549 $3,044,285 Prepaid expenses and other assets Prepaid income taxes. 49,018 Total current assets Grainger reports the following footnote relating to its receivables. Allowance for Doubtful Accounts The following table shows the activity in the allowance for doubtful accounts. For Years Ended December 31 ($ 000s) 2015 2014 2013 . 10,181 12,945 8,855 Write-off of uncollectible accounts, net of recoveries. . (10,495) 9,628) (7,942) (1.292)(266) Provision for uncollectible accounts Business acquisitions, foreign currency and other... 481 Required a. What amount do customers owe Grainger at each of the year-ends 2013 through 2015? b. What percentage of its total accounts receivable does Grainger deem uncollectible? (Hint: percent age of uncollectible accountsallowance for uncollectible accounts/gross accounts receivable) 2013 through 2015? cally, did the allowance increase or decrease as a percentage of gross accounts receivable, and why? c. What amount of bad debts expense did Grainger report in its income statement for each of the years d. Explain the change in the balance of the allowance for uncollectible accounts since 2013. Specifi