Calculation of the net sum of the gross sum

 

After the gross sum (including Sales tax) is input, the sales tax function can be activated. 

 The system queries whether it should be added (included) or subtracted (calculated) in the input column.  With subtraction, the sales tax is calculated.

 

... and with termination of the calculation through the ENTER-key the net values are calculated and checked.

 

 

 

 

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