Ultra PJ

An ant knocks the door of a house. House owner opens the door.
"I want a place to stay", said the ant .
"I have a vacant room which you can occupy for free of cost",
said the owner.
Ant went inside and occupied that vacant room. After some days,
the ant brought in another ant and requested the owner "Can you
please allow this ant to stay along with me".
"Oh sure, you can do so without paying any rent" said the owner.
After some days the ant brought one more ant and requested the
owner to allow that ant to stay with it. Owner agreed to it without
asking for any rent. This continued i.e ant brings in one more ant and
owner agrees for it. On one fine day, the ant brought in tenth
ant and requested the owner to allow that tenth ant also to stay with
it.

The owner said "Ok, you all can stay here but you need to pay
rent".

Now the question is Why did the owner ask for rent when the tenth
ant came in?
Scroll down for the answer
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Because they are now Tenants (Ten ants) !!