DMR's 2011 manual built its models on 70 percent biological efficiency for oyster and 18 kg per 100 kg compost with six crops a year for button in controlled rooms. Its undated folders put the cost of producing a kilogram at 10 to 15 rupees for oyster, 20 to 25 for button and 20 to 25 for milky, with milky selling at 60 to 80.
Every one of those is a dated reference from 2011 or the early 2010s, marked medium confidence in this course's fact base. Use them to learn the shape of the sums, never as today's numbers.