Hello Stevo,
1. Does the load balancer of image below have 1 or 2 rules?
As per the image provided, the LB has 2 forwarding rules, one on port 80 and the second on port 443.
2. How you will charge us if we have 5 load balancers without rules?
3. How you will charge us if we have 6 load balancers without rules?
It's not possible to create a Load Balancer without a forwarding rule. So the charge will be for the forwarding rule as mentioned in this Help Center article.
Ephemeral and Static IP as long as they are being used by your LB forwarding rule, you don't get charges for the IP however the charges will be for the forwarding rule and the traffic through the external IP address. More information about our estimate pricing can be calculated in the Google Cloud Calculator.
Once a LB with forwarding rule is being created, the IP can't be changed. However, creating a new forwarding rule will have a new IP address.
I hope this helps.
Sincerely,
George