Open calculator and...

[Fahrvergnuugen]

Add these 4 numbers together in the order that i've listed them:

3150.00
539.40
900.00
42.07

I get 4631.469999999999

 

[Arden]

It's been discussed before. It's because OS X's calculator uses base-2 math instead of base-10.

 

[brianleahy]

Yeah, I brought it up before. Weird, eh?
Try multiplying all your #s by 100, then divide the sum by 100. All integer math!

 

[ElDiabloConCaca]

http://www.macosx.com/forums/showthread.php?t=40723&highlight=calculator