My quick take on point 2 -
Typically, Rs. 39 crore investment in wind turbine = 1.25 MW power generation. 1MW = 8.76 million units. With power load factor (PLF) of 20%, it will generate 2.2 million units (=20% multiply 1.25 multiply 8.76) at cost of Rs. 30 paise per unit.
In absence of this turbine, cost per unit = Rs. 2.5 per unit. So cost saved per unit = Rs. 2.2/-
Assuming, all the power generate is used then P&L impact = +Rs. 48 lakh. (=Rs. 2.2* 2.2 million units generated). Other benefit is on tax outgo due to higher depreciation charge on wind turbine.
Explanation for point 3 -
Company did trading of Rs. 10 cr. in Sept. 2015 quarter. Which means company purchased (and did not manufacture) stock worth Rs. 10 cr. and sold at similar levels in same quarter so sales of Rs. 82 cr. in Sept. 2015 = manufacturing sales of Rs. 72 crs. + trading goods sales of Rs. 10 cr. This trading was absent/negligible in Dec 2015 quarter as stock in trade was Rs. 33 lacs only. So entire Dec 2015 sales came from pure play manufacturing with no trading component. Hope this clarifies.