Multiply Total on added fields

Hello

I’ve recently started with cost calculator so please be gentle.

I have a simple form with two drop lists and a slider at the bottom. The goal is to have a user select which size room they want and on the toggle select how many days and get a total.

These are the steps Im taking

First field has two items Cat and Dog at zero value
Second field has 5 room sizes each for a different price(Value)
Lastly a Slider that should multiple the selected room size by the days selected

So if they selected Room Size 1 at a value of $42 multiple that with the slider bar. So if they select 3 days total should be $126

Here is a link to the image of the form https://ibb.co/wYrsLp8

Thanks in advance for any help

The page I need help with: [log in to see the link]