Simple Macro For Dividing Cell Content By 100 Needed

I'm only starting to get into the Macro side of excel, and I've created a couple of macros to automatically format cell contents and the like.
However I'm having trouble trying to divide some cell contents by 100.

I have 2 files I'm working with, one contains information regarding cd's and percentages, however the percentages in this file cannot be formatted to percentages (so the powers that be say) for whatever reason.
I copy all this information into another file which does have the percentages formatted as percentages, the result is that the values get multiplied by 100.

So values that read:
100
50
50.25

for example, appear on the new sheet as:
10000%
50000%
5025%

Is it possible to write a macro that will divide these percentages by 100 so the read correctly as:
100%
50%
50.25%

the macro will have to work on selected ranges.