Answer:
2 option I think, if I'm wrong so sorry ;(
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Answer:
what the question in this
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Answer 
The owner lose is $100 .
Reason
As given
A man comes into a store and steals $100 from the register without the owner knowledge.
Comes back and buys $70 worth of stuff and the owner gives him $30 in change.
 i.e First man steals $100  than give back to owner when he buys  $70 worth of stuff and  the owner gives him $30 in change. 
Therefore the total owner lose is the sum of  $70 worth of stuff and  $30 in change.
Total owner lose = $70 + $30
                             = $100
 Therefore the owner lose be  $100 .
Hence proved