How can we setup if an employee updates Task completion Percentage it updates the Goal Percentage?

Summary:

Tasks Completion Percentage should be linked with Goals

Content:

Based on the Tasks completion percentage the Over all Goal Completion percentage should show

For Example: I have been assigned a goal with 3 tasks in it. Let’s say I want to update the Completion Percentage of 1 task to 25 Percent, Task 2 to 50 Percent and Task 3 to 100 Percent.

Based on the completion percentage that I choose on Task the overall goal completion percentage should change. How do we do that?