Is it not just a simple

=AVERAGE(A1:A20)*20%

--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)

"cwilson" wrote in message
...
My husband is a junior college teacher and needed to know how to calculate
an
average by a certain percent. Say if homework was 20% of their total
grade,
how would he write the formula for that?