I had the MS Calculator set to standard not scientific, when I changed to scientific I got the correct percentage number.
How come you multiple the number again;
2345 - .45 x /2345/ ?
You have the number and you want to reduce it by 45%. First you calculate what 45% of the number is and then you would subtract it from the number.
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.