I want two things 1-With a user input (if input=4), Making a loop of forms equal to the input (4 forms) 2-Making the paid price dynamic

Hi , hope you all will be fine .
I have two question which i will explain here
I have a premium website on wix which is https://myeasyleasing.com .
There is a page whose link is https://www.myeasyleasing.com/enteryourinfo and a form is built there which is a dynamic form which takes data from form , put that into db table and then shows on website .

I will charge 5$ for one form submission . (form is about selling the room submitted by user ). Now if user wants to put info of one room then he will add info of one room , pays 5$ and then his info will be submitted in database and will be shown on live …This all has been done already .
Now what if user wants to add multiple rooms specifications in forms ?
For example if he wants to add 5 rooms specifications then he has to fill 5 forms one by one .
Is there any way that user will submit info for rooms one by one and then he has to pay amount(5number of rooms ).
Simply is there a way to make the loop of forms till he adds all the information of all rooms and then he has to pay the amount .
We can ask the user how many forms/rooms he wants to fill and then show him the loop of forms till his last form is submitted then he should be redirected to payment .
Simply if i ask is how to upload information of multiple forms /room by a single user ?
Now about payment i’ll explain
(Same scenario as before )
If i ask user , how many forms he wants to fill , he puts 4 in that input field then i want to charge him 4
5=$20 (number of forms * 5) , Basically i want the paid amount to be dynamic in wix ?
I want the amount should be increased ( 5 times) with the number of forms filled .
5 forms = 55=$25
6 forms = 5
6=$30

Is it possible in wix , With any application or something like that?
Or if you think there is any alternative for this scenario ?
How can i do this ?
Please help me in this!!
Thank you !!

Yisrael has already done a simple tutorial for prices that might be an easy option for you to integrate into your code somewhere - https://www.grampsworkbench.com/Examples/Attendance-Fees

As for the form itself, you could have two options, one for a single room entry and one for multi-room entries. That way you could use a multistage form that lets the user enter one rooms details at a time before moving onto another page for the next room and then the next room etc.

Here is a Wix tutorial for multistage form which you could use as a starting point for your own form.
https://www.wix.com/corvid/example/multistage-form

In multistage forms , where to put that example code ?
And from where i will decide the number of forms ?
Can i get these things in a video tutorial ?
Its still confusing !