Calculating price by sqm

Hi!

I’m trying to figure out how to create a form-calculator where customers can see an estimated price for cleaning services that is specific to the size of their house. It should be adjusted for the following prices (kr=swedish currency):

0 < 30 sqm: 1600 kr
31 < 49 sqm: 1900 kr
50 < 59 sqm: 2100 kr
60 < 99 sqm: 35 kr / sqm
100 < 129 sqm: 33 kr / sqm
130 < 300 sqm: 30 kr / sqm

I’ve figured out how to adjust the prices for sqm between 60-300 with the following example of my conditionals:

Action: set factor
Target element: *numbers element*
TV: 30
CO: Between
Compare Value: 130:300

That part i working great, but where i struggle is the first three static pricelevels. I currently have the following conditionals:

Action: set
Target element: *numbers element where customer types in sqm*
TV: 1600
CO: between
Compare Value: 1:30

It technically works, as long as the customer doesn’t change the value. Because once the a static price has been set it cant be changed to the prices between 60<300 sqm (the other way around doesn’t work either), instead it’s stuck at 2100 kr (and visually the estimated price for the static pricelevels is weirdly small).

If I could get some help with this it would be greatly appreciated!