@Ramesh_Pitchuka you can try using Automa (http://www.getautoma.com/) which is a tool written in Python that lets you automate tasks in the graphical user interface (GUI) using simple commands such as start, click and enter. So, in order to click on the "Calculate" button, all you need to do is start Automa and then input the following:
start("name_or_path_to_the_application_you_are_automating")
click("Calculate")
Automa finds buttons and text fields like a human being would do - by their visible labels/descriptions, not by internal IDs.
