my sal is 12000 i am expecting 40% hike that means how much increment i will get

I think that means "how much more will i get paid"

40% of 12000=40/100*12000 

You can finish it on the site calc on the home page 

You'll get a raise of $ 4800, meaning you'll make $16,800 yearly.  If you can't figure something as easy as this, I'd CUT your pay.

Well that is not very nice anonymous - I think that we will cut your pay instead.  lol.