Heyy dear ! Sorry to say they won’t give you any marks for correct procedure ! I am telling you this with my previous experience! I inspected my certified copies ! & they dint give me narks for that wrong calculation part !
sorry to say but there is very less probability to allot marks bcoz if ur initial is wrong then why examinor will go to next step..and it is my own experience in costing paper..but lets hope for best..all the best