Go to the c:\setup.exe --> install features on this instance, install R
https://github.com/GoogleDeveloperExperts/sql-server-on-gce
Pricing - free trial for Express, .01/core per hr for Web, .16/core per hr for Standard
See also - 'creating high performance SQL Server instances' --
https://cloud.google.com/compute/docs/tutorials/creating-high-performance-sql-server-instance