WordPress form for calculation of product price from a data table – any plugin?

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I have a data table with set quantities (30, 50, 100, 300, 500, 1000) and product size (4″, 5″, 7″, 10″).

I need to set up a calculating form for price where the user would chose the quantity, product size, and possibly some other upgrades (price also predefined) and the price would be calculated based on the selections. There is no formula that could be used because the price changes (lowers) with higher quantity.

Is there such plugin that would allow me to do this? What I see so far is mostly forms that can calculate based on formula. Have been looking for some time.

I know i could perhaps come up with if, else, but that is too complicated for me plus, I would not know how to plug it into WP.

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