Free Download and Free Use the Annuity Calculator for Android to make calculations of the credit payment sums through the annuity scheme of paying off.
Screenshot of an android application "Annuity Calculator"
The following actions are performed only on your mobile device:
Enable Settings/Security/Unknown sources
This allows you to download apps from sources other than Google Play to your mobile device
Download and install this application
Do not forget to disable Settings/Security/Unknown sources