Is there a shortcut to workout what 95% of amounts in your head?

I am a dealer at a casino and will learn baccarat soon, and if banker bet wins we take 5% eg $100 bet we pay them $95. However, the amounts get pretty big and unfriendly eg $33,235! I can work out the 5% easily enough, but can’t for some reason struggle to take it away from the original amount. I was wondering if there was a quicker or easier way to work it out.