when is the end date of sharepoint 2013 general support and what is covered by extended support and its cost.

We need to know the general support end date of sharepoint 2013 and also want to know cost of extended support.

Please find SharePoint 2013 support end dates-

Mainstream support ends around 2018.

https://support.microsoft.com/en-gb/lifecycle?p1=14944&forceorigin=esmc

MCTS Sharepoint 2010, MCAD dotnet, MCPDEA, SharePoint Lead