1) 03 friends took lunch in an hotel and they paid Rs.75(25,25,25)..manager return back Rs.5 to waiter,he put Rs.2 in his pocket as a tip and return Rs.3(1,1,1) to those 3 friends..
its mean they spent 24+24+24=72+2(Waiter Tip)
Total=Rs.74
Where is the rest of Rs.1?

2) i am a word 5 letters,if you remove my ist word,i am a form of energy,if you
remove my ist 2 words,i am necessary for living...if you remove my ist 3 words
i am on you...if you remove my ist 4 words,people take me.Guess who am I?