WS forms + Woocomerce

Hi, I need some one who is familiar with WS forms. https://wsform.com/
I need someone who knows jQuery.

I have a form linked to a woocomerce product. It has multiple range sliders that need to add to the price of the product.

I need the range slider to be customized as such:
We are selling cans of our product. Each can is good for 4 rooms. So the user selects how many rooms they have and the product quantity will go up accordingly:

1 - 4 = £10 (quantity : 1)
4 - 8 = £20 (quantity : 2)
8 - 16 = £30 (quantity : 3)
Etc

I have the form set up with repeating fields so they can add more than one building at the moment meaning additional sliders can be added to the form.

PLEASE ONLY BID ON THIS IF YOU KNOW HOW TO USE WS FORMS AND jQuery AND YOU HAVE TIME TO DO THIS JOB NOW.

Thanks for reading!