As i have watched your lecture on this question still i have doubt , why we are adding to the extra revenue 200*39.98*10 ? this is the normal production ryt ? we should onli include in the extra revenuew the sales with the hormone ie, 202*75*10 . Iam mistaken here
We are not adding 200*39.98*10 to the extra revenue.
The extra revenue is the difference between the revenue that we get if we add the hormone (202*75*10), less the revenue we would have got (200*39.98*10) if we had not added the hormone.