Hey so this is part of a bigger project where I calculate the taxes but somewhere there’s a problem that I can’t seem to figure out after studying about tax calculation – maybe the problem is closer than I think and someone with a fresh mind could find out the problem ?

I have a hard problem and I cannot fully solve it using PHP and/or Mysql.I have two arrays payments and invoices per user.

i wanna make a WebApp for holy Quran to have an image (surah to arabic , using API) and translation under it

I want to ask you to tell me the correct algorithm.