It is Friday night. but I m still working. Lots of paper job. It is boring and I m tired. T.T

I use Excel 2010 doing my job. and I wonder what is the difference between IRR and XIRR function. NPV and XNPV functions also are mystery. I asked my colleagues some times but no one could explain it clearly.

Hi. I m Jonadan. This is my first post on steemit. I m not native English speaker but I think this is the better way to communicate the world. See u again.