Chapter 5, Problem 23ME

Please given correct answer for General accounting question I need step by step explanation

Fernando Traders has a balance date of 31 December. On 1 January 2XX3, it had an opening inventory balance of $15,000. During the year, Fernando Traders purchased $30,000 worth of goods for resale. On 31 December 2XX3, the closing inventory balance was $13,000. Sales for the year totaled $50,000. What is the Cost of Goods Sold for Fernando Traders for the period ending 31 December 2XX3?

General accounting question