Accounting method of inventory according to selling price and amount

At the end of the period, the price difference of sold goods shall be calculated according to the following methods: price difference rate = price difference balance of goods+price difference of goods purchased this month ÷ (price of goods in stock at the beginning of the month+price of goods in stock this month) × 100% of goods sold this month = income of main business this month × credit amount of price difference subjects apportioned according to price difference rate. So:10000+30000/70000+10000+130000 =19.05% of the price difference:150000 */kloc-0.