During 2019, Oilers, Inc. ("Ol") started business and had the following transactions during 2019. A. \\( \\$ 600,000 \\) of credit sales ("CS") B. Collected \\( \\$ 250,000 \\) of the CS C. Wrote off a \\( \\$ 10,000 \\) receivable from Jayhawks, Inc. ("JI") D. Ol estimated that \\( 15 \\% \\) of its Accounts receivable would not be collected. Required: determine bad debt expense for the year ended 12/31/19 and the ending balance in the allowance for doubtful accounts and the ending Accounts Receivable Balance. During 2020, OI had the following transactions A. \\( \\$ 800.000 \\) of \\( C S \\) B. Collected \\( \\$ 600,000 \\) of the 2020 CS C. Collected \\( \\$ 300,000 \\) of the 2019 CS D. Wrote off a \\( \\$ 20,000 \\) receivable from Commodores, Inc. E. Collected \\( 30 \\% \\) of the \\( \\mathrm{JI} \\) receivable that had been written off in 2019. F. Ol estimated that \\( 25 \\% \\) of its ending A/R balance would not be collected. Required: determine bad debt expense for the year ended \\( 12 / 31 / 20 \\) and the ending balance as of