Mr. Raj Waghadkar... How you say "sale amount is on new 2gm gold value"...? I can give example in your way. 1gm is Rs. 10000. You receive the gold 3g from "CUSTOMER". But, You ll Can't give/calculate it's 30000. You less some other in that Old Gold. After ll be calculate 20000. Then you give 5gm... You prepare the "CASH MEMO" as follows. 5gm gold = 50000 less old = 20000 Balance = 30000. In this way you can set off your billing at your way.... Am I right....?