How much money did I Loose ?

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How much money did I Loose ?

Answer me this...
Someone came into my shop and
stole $100 from the register without my knowledge.
The Person came back with the same $100 five minutes later
and he bought $70 in items and
I gave him back $30 change.
How much money did I Loose ??

Very Puzzling.
Take some time to think and try to answer correctly !!

Click here for Answer

I would loose $100.
$70 in Items and $30 change.