re: I swear there are some dumb people on the face book and the TD.COM

quote:

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I say the owner has a net loss of $200.
Let's say the register had $200 to start.

If there was no theft and the owner sold $70 worth of inventory he would have a total of $270

With the robbery (200-100-70+70-30)= $70
-100 for initial theft
-70 for loss of groceries
+70 for the transaction
-30 change from stolen money

$270-70=$200

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To make it easier on you, assume that the thief and customer are two separate people. Register has $200, thief steals $100. Now a customer buys $70 in groceries, the register only has $170, but should have $270.
$270 - $170 = $100.

You are thinking way too much simply because you know the money being used was stolen. The fact that the money was stolen has no bearing on the register and actual cash lost in the scenario.