Display incl. Tax Price on the www.royalstorage.rs Website

Display incl. Tax Price on the www.royalstorage.rs Website

Hi,
I want to address the question about displaying prices including tax in the way that clients who want to rent storage can see the final price displayed on the storage. 
I am not sure that there is an option, I have checked the knowledge base and didn't find anything related.
Please find the attached picture for reference.