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He lost out on the sail cost of those goods thoughWholesale cost of the goods + $30
Approach it as two different stores. Stole $100 from store A. Bought $70 item and got change in store B. Store A is out $100. Store B has no loss, sold $70 and added $70 in cash to register. Only "loss" was original $100.
You could also use same store different customer approach to get to only $100 loss.