Explain why the following method works lo calculate the amount to be paid in a restaurant If you wish to add a 15% tip lo the original bill amount A. First you write down the amount A. Then you move the decimal point in A one unit lo the left and write this amount under A. Finally divide this second amount by 2 and write this amount down also. The total amount (including tip) to be paid is then the sum of the three amounts you have written down.
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