[经] ratio of break-even sales to actual sales

gòu běn xiāo shòu é duì shí jì xiāo shòu é bǐ lǜ ㄍㄡˋ ㄅㄣˇ ㄒㄧㄠ ㄕㄡˋ ㄜˊ ㄉㄨㄟˋ ㄕˊ ㄐㄧˋ ㄒㄧㄠ ㄕㄡˋ ㄜˊ ㄅㄧˇ lv4