A correction

=IF(OR($B28="",ISERROR(MATCH(-$A28,$A28:$A$1000,0)),),"",$A28*(OFFSET($B28,M
ATCH(-$A82,$A28:$A$1000,0)-1,)-$B28))

--
When sending mail, use address arvil<attarkon.ee
Arvi Laanemets