Koss Co. Ltd. began operations on January 1, 2015. It had the following transactions during 2015, 2016, and 2017. 2015 Dec. 31 Estimated uncollectible accounts as exist5,000 (calculated as 2% of sales) 2016 Apr. 15 Wrote off the balance of N. Lang, exist700 Aug. 8 Wrote off exist3,000 of miscellaneous customer accounts as uncollectible Dec. 31 Estimated uncollectible accounts as exist4,000 (1 1/2% of sales) 2017 Mar. 6 Recovered exist200 from N. Lang, whose account was written off in 2016: no further recoveries are expected Sept. 4 Wrote off as uncollectible exist4,000 of miscellaneous customer accounts Dec. 31 Estimated uncollectible accounts as exist4, 500 (1 1/2% of sales). Required: Prepare journal entries to record the above transactions Assume that management is considering a switch to the balance sheet method of calculating the allowance for doubtful accounts. Under this method, the allowance at the end of 2017 is estimated to be exist2,000. Comment on the discrepancy between the two methods of estimating allowance for doubtful accounts