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 (S 000s)2015 2014 Cash and cash equivalents Accounts receivable (less allowances for doubtful accounts of $22,288, $22,121 and $20,096 respectively) 1,209,641 1,172,924 1,101,656 . 102,669115,331 75,819 15,315 Prepaid expenses and other assets..... 85,670 . 61,387 47,529 49,018 Grainger reports the following footnote relating to its receivables. Allowance for Doubtful Accounts The following table shows the activity in the allowance For Years Ended December 31 ($ 000s) -2015 ig 2014 2013 12,945 8,855 for doubtful accounts Write-off of uncollectible accounts, net of recoveries .. (10,495) 9,628) (7.942) Business acquisitions, foreign curency 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 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- age of uncollectible accounts allowance for uncollectible accounts/gross accounts receivable) 2013 through 2015? ally, did the allowance increase or decrease as a percentage of gross accounts receivable, and why' Grainger had kept its 2015 allowance for uncollectible accounts at the same percentage of gross accounts receivable as it was in 2013, by what amount would its pretax profit have changed? Explain erall, what is your assessment of Grainger's allowance for uncollectible accounts and the relatec bad debts expense