Question

Someone came into my shop and stole $100.00 from the register without my knowledge. The person came back in with the same $100.00 five minutes later and he bought $70.00 worth of items and gave him back $30.00 in change. How much money did I lose?

Answer 1

$-100 - $70 = $-170.00
$-170 + $100 = $-70
$-70 -$30 = $-100

The shop owner lost $100.