Update Approval Status of Folder based on approval status of folder items

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SharePoint

SharePoint2013

I have a SharePoint list which contains folders. Each folder contains one or more items. I wish to update the folder approval status to "Approved" when all the items inside the folder are approved.

The workflow should trigger whenever the approval status of one or more items inside the folder is changed and is expected to check the approval status of all other items inside the folder. If all the items are approved the folder's approval status should be set to "approved".

I am designing the workflow via SharePoint Designer 2013 and using SharePoint Online 2013 .

Thanks a lot in advance.