Need to calculate the rate, VAT upon entering the amount. How do we achieve this?

For instance, if the user types the amount of an item, including the rate and VAT, we need the system to automatically calculate rate and VAT using the quantity and the amount.

How do we do this?

Maybe this can serve as inspiration. Plenty of values get calculated here.

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@rmeyer
Your comment, and this page helped. Thanks a lot!

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