Math Logic

Question :
What is the 'Austrian Method' of subtraction ?

Answer :
The Austrian Method of subtraction is generally used by shopkeepers in Europe while giving change to a customer. In the Austrian Method instead of Subtracting the amount of the purchase from the amount of the coin or bill given in payment, they add from the amount of the purchase upto the next higher money unit, then to the next, and so on until they come to the amount of the coin or bill given in payment.
For Example,
If the amount of purchase is £ 3-23 and the bill given in payment is £10-00. They give the customer the following money units for this change.
5 pence and 2 pence to make the sum £ 3-30, then two 10 pence to make the sum £ 3-50, then a 50 pence to make the sum £ 4-00 and finally six one pound notes to bring the sum upto £ 10-00.

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