David,

yes, you're right, of course. My answer was written when I was about to leave my office... :-)

REPLACE ALL PRICE WITH PRICE/100*(100+nPercentage) && Increase
REPLACE ALL PRICE WITH PRICE/100*(100-nPercentage) && Decrease 

>Tore,
>
>You need a / 100 in there.
>
>

>>REPLACE ALL PRICE WITH PRICE*(100+nPercentage) && Increase
>>REPLACE ALL PRICE WITH PRICE*(100-nPercentage) && Decrease