How to solve the cost of goods sold that the answer is 77500?

I want a detailed explanation.

Inventory Cost of Goods Sold Sales Revenue Beg bal 10,500 End bal 15,500 Bal 73,000 Bal 119,000 A year ago, the net realizable value of ending inventory was $12,800, which exceeded the cost of $10,500. Huron has determined that the net realizable value of the October 31, 2018, ending inventory is $11,000. Huron Garden Supplies Income Statement (partial) Year Ended October 31, 2018 Sales revenue 119000 Cost of goods sold 77,500 41500 Gross profit