Help with a logic form

I am looking to have the same functionality as this form with Gravity Forms … Has any one set anything like this up before … its beyond my brainpan lol. We are looking to have the same services … the stock prices changes with each size change … price per drops with the quantity,

Thank you in advance to all that reply ! - Brandon

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How about this:

Or the paid Perk:

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I did something similar to this using a custom JScript calculator embedded in an order form.
Check it out here. If this will help I’ll export the form.