The only Indian cost of production figure in our source set comes from DMR's undated Hindi farmer folder, which reads as early 2010s. It gives a seasonal white button production cost of Rs 20 to 25 per kg and states a margin of at least Rs 25 to 35 per kg.
That is a reference from another decade, not a forecast for you. Straw, spawn, coal, labour and power have all moved since.

