calculate in a form

Mario Van Poppel

12

I would like to include a special kind of form in my website. In the form, there should be a field where visitors could fill in a quantity, lett’s say silver (for example 4 gram). This quantity should then be multiplied by a conversion rate (determined by me, like 1 dollar per gram) to calculate a value (4 dollar). The form should have multiple rows (one for silver, one for gold, platina,…). The bottom row should calculate the total value of all combined items. My wish for an action: a form that can calculate

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