I just need help with marked incorrect. Thank you!

Nash Company uses the gross profit method to estimate inventory for monthly reporting purposes. Presented below is information for the month of May. Inventory, May 1 Purchases (gross) Freight-in Sales revenue Sales returns Purchase discounts $ 171,200 596,600 28,400 957,000 64,700 12,300 Your answer is correct. Compute the estimated inventory at May 31, assuming that the gross profit is 25% of net sales. The estimated inventory at May 31 $ 114675 e Textbook and Media X Your answer is incorrect. Compute the estimated inventory at May 31, assuming that the gross profit is 25% of cost. (Round percentage of sales to 2 decimal places, e.g. 78.74% and final answer to 0 decimal places, e.g. 6,225.) The estimated inventory at May 31 $ 114675 e Textbook and Media