Taxable value in itc 04

Repected Members,

Which amount to be consider in Taxable value in ITC 04 (Details of goods/capital goods sent to job worker and received back).

in case one person purchse R.M. from A 1000 qty. @ 100 Rs.  = 100000+tax and also purchase R.M. from B 1000 qty, @ 80 =80000 When goods is to be sent to jobworker say 800 qty. which value to be consider in taxable value 800*100 or 800*80 (since above both purchased R.M. are same and also in store in same place.)