An a hundred

I have not received many perfect scores in my life, but when I do I refer to them as "an a hundred." 

However, 99% is "a 99" but 100%.... "an a hundred" I guess I just see "a hundred" as the compound noun. 

People laugh at me for this....

I also pronounce faucet (and write most of the time) like flaucet. 

It is a good thing I am not teaching English.