Using the following mathematical technique, we can quickly answer this mathematical issue.
The value of the initial loss is Rs. 1000.
Now we must compute the amount recovered. If the guy spends Rs. 700 at the shop, the store owner would almost certainly offer him with items or services worth Rs. 700. As a result, there will be no recovery in this situation.
Now, the guy provided Rs. 1000 in exchange for Rs. 700 in goods/services and received Rs. 300 in change, therefore the store will not be able to recoup any money.
Final loss = Initial loss – Recovered amount = 1000-0 = Rs. 1000