How to make a calculation like on olshop ?

Question

I try make olshop . this is my first project. please help me

Answer 1

Hmm, have you tried Google? It's a really good tool for looking up things that you don't understand how to do. Or if you clarify your​ question, we might be able to give you some actually useful advice, because as it stands, I don't know what an olshop is (I assume you mean online shop) and your question is vague and broad.