How much money did owner lose? Show work please & explain

Question

A guy walks into a store and steals a $100 bill from the register without the owners knowledge. He comes back 5 minutes later and buys $70 worth of goods with the $100 bill the owner gives him $30 in change , how much money did the owner lose???

 

Show work please

Answer 1

$100 taken = -100

$70 back =    + 70

$30 given =   - 30

                   --------

                     -60

 

He lost $60 in cash.

 

The store also has $70 loss of goods purchased

with the stores own money... So the store is actually

out $130 in cash and goods.