re: Help with riddle - How Much Money Did The Store Lose?

Let’s say store has $200 in register. If they sell $70 of goods, then they have $270 in the register and are down the cost of the goods.

Now if $100 of the $200 is stolen, they have $100 in the register. If that $100 is then used to buy $70 of goods, they have they have $170 in the register after giving $30 in change. And are down the cost of the goods (just like above).

They have lost $100.