sashiksu 0 Light Poster

HeY First I'm new to software developing side.
I made some system abount money lending and some my teachers said that system good but there is wrong thing at finding profit/loss page.
Therefore I want your advices guys ! :)
In this system user can register new clients and also their loans.
Another form is there for collect settlments from one who brought loans.
I need to find profit/ loss.
But some clients pay different amounts for there daily settlments.
Then I can't just say this is capital and this is interest income by one settlment.
What should I do to this?

Currently I find profit by below theory:
select two dates using date time pickers and then filter from database one who completed paying loan. And get that loan's full interest income to between that date range.
And like that get amount of expenses between same date range.
then income-expense=profit/loss
Also need your advices and programically practically help :)
Thank You !

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