This is occasionally done by unscrupulous people who know that when you roast a kilo of coffee, you might only get 850 grams out because of loss of moisture and other things during the roasting process.

这种做法偶尔会被一些肆无忌惮的人采用，因为他们知道，当你烘焙一公斤咖啡时，由于水分和其他物质的流失，你可能只得到850克咖啡。