Retaining Excel formulas

i've created fillable invoice in excel formulas add totals, subtract discounts , include tax. can these formulas retained when converting invoice pdf in acrobat x? use pdfs on our ipads.

 

so when sales rep fills out cost of each item, automatically added, discounts automacally deducted , when tax rate entered, correct tax dollar amount added.

they can't retained excel, calculations can redone in acrobat, using either 1 of built-in methods or javascript.

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