[经] applying cost ratio to ending inventory

yìng yòng chéng běn bǐ lǜ jì suàn qī mò cún huò ㄧㄥˋ ㄩㄥˋ ㄔㄥˊ ㄅㄣˇ ㄅㄧˇ lv4 ㄐㄧˋ ㄙㄨㄢˋ ㄑㄧ ㄇㄛˋ ㄘㄨㄣˊ ㄏㄨㄛˋ