Good Day @Kevin ,
Welcome and thank you for the question, If you have access to the costing I would advise you to have a look at the trending. Take into consideration storage growth and uptime of the VM's.
Scroll down to find the link.
View cost breakdown by Azure resource
https://learn.microsoft.com/en-us/azure/cost-management-billing/costs/cost-analysis-common-uses
Please mark as answered if the information was helpfull.
Regards
M