Incorrect because the store got $70 back. I know it is with money stolen from them but you can double the $70 if they have $70.130 or maybe 200?
Original 100 + 70 in goods + 30 change = 200. Yes or no?
Thought about it again, @unassuming is right.
I'm with this answer.$100. They have $100 less than if the money had not been taken.
Everything in the question after first $100 theft is a red herring.