Consider the following information for Tuffaha Company, which uses a periodic inventory system: The company sold 25 units on May 1 and 20 units on October 28. Required: Calculate the company's ending inventory and cost of goods sold using FIFO. (Round the per unit cost to 2 decimal places and then round your answers to the nearest whole dollar.) COGS: b. One-thint of the work related to $18,000 of eash received in advance was performed daring this period. c. Vepaid acerued salaries at December 31 amounts to $15,000 d. Work was completed for a client on December 31 in the amount of $21,000, but was not previously billed or recorded. c. Estimated depreciation on office equipment is $27,000. f. The company pays income tax at an average rate equal to 15 percent of the company's income before taxes. Taxable income is 250,000 . They have not paid taxes owed to the government yet. g. The company had $3,800 of supplies on hand on December 1 , Year 1 . When counting the supplies on December 31, Year 1, Salma's found only $1800 worth of supplies on hand. On December 31, 2018, Baloot Inc, had Retained Earnings of $267,800 before its closing entries were prepared and posted. During 2018, the company had service revenue of $168,100 and interest revenue of $81,300. The adjusted deferred revenue account shows a balance of 10,000 . The company used supplies in the amount of $87,900, advertising expenses were $16,400, salaries and wages totalled $18,300, and income tax expense was calculated as $13,700. During the year, the company declared and paid dividends of $4,000. Required: a) Prepare the closing entries dated December 31,2018 . b) Calculate the ending balance of Retained Earnings Account. Bonus (2 points): Allowance for doubtful account is a contra-asset account (true / false)