Caldera form calculation form

We use Caldera Forms for our Website. We are a B2B distributor for advertising goods. When a customer order directly via the form he has now the option to choose his desired amount (via dropdown menu determined by us/ our scaled price chart) This is fine and works very well. But with this standard form the customer does not have the possibility to choose an amount of his choice, for this he has to contact us in an extra mail, or call etc. I want to make it as easy for the customer as possible. As we have scaled prices like for from 50, from 100, from 250, from 500 pieces etc, the prices of each piece depends on the amount the customer wants to buy. So I need a manual formular for this calculation plugin which calculates the price depending on the quantity.

For example the customer types in the quantity field "300". Then I would like the form to do the calculation of 300 x "price per piece for 250" and if he changes the amount like to 240, the form takes the price for the next lower scale in the chart, in this case the price for 100 etc.

I hope this is kind of understandable. Please let me know if you can help me.

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