I want to create an app for teachers to be able to see their student details and their income

Hello
I want to create an app for teachers to be able to see their student details and their income.
I am trying to use SUM function to show the sum of all the payments from the students in the payments area for the teachers to see.
This is the current display in my app (images attached)

But I prefer to show the total for June and July.
Also if possible I prefer to show at the bottom of the total, half of the total.
Moreover, if possible to compute and display deductions from this half amount as well.

Hi,

You have to create virtual column to SUM both month.

Another question: How do I show the result of dividing the SUM of a virtual column ?