Is it allowed to change the price in different versions of an app?
For example, I want to price my version 1.0 app 1 euro, and version 2.0 app 3 euros but still keeping the people who use version 1.0 app updating there app to version 2.0 WITHOUT ANY CHARGE for they supporting me in the earlier versions.

Is it possible and allowed to do this?

Also, can I change the price without update the app version as a marketing movement any time?