please show method

The conventional view of depreciation is that it is necessary because O A. cash needs to be set aside to replace the non-current asset O B. non-current assets can be reported at the amount they are worth C. it will help to provide a conservative figure of profit for the year OD. a portion of the cost of non-current assets is matched with the income they help generate Martinez Retailers produced the following information for the most recent year: 1. Sales revenue 280,000 2. Opening inventories 65,000 3. Gross profit 20% of sales revenue 4. Closing inventories 140% of opening inventories What were the purchases for the period? What were the purchases for the period? 250000 ((Type an integer.)