You can't do that by a formula, but if you put 30% in a cell, copy it, then
select C5, edit/ paste special/ multiply, that will do it.
--
David Biddulph

"byway" wrote in message
...
Hi
how do I create a formula as below

Enter a value in a cell; E.g Cell C5 and the formula automatically
multiplys
the value by say 30% and keeps the result in cell C5.

Many thanks