Gold cost of sales

Yes, the above formula is correct, include depreciation, and amortisation as well

Yes, there was error. But I still feel it higher. The closing stock is inventory available at the year end valued at the rate as on that date.

It doesn’t matter! As far as cos  is concerned= opening inventory+purchases - return+ amortisation/ depreciation & nrv of damaged goods and a lot more than I know.  So what is your problem now, if you need a formula, I have every formula from online you know. 

@ yasaswi gomes: Why are you wasting your time? I did not ask you. In fact you could not identify error which Anand did. Do not respond to my query please.

Shakeel sry your correct. I will do what your saying and I have modified my previous answer