Need formula that calculating price or(and) margin!

Hi, Guys.

This is my 1st post. LOL
It is nice to meet you all of you.

I am working quote sheet as attached.
I am getting price based on Margin % but after I got price sometimes I'd like to change the certain number.

For example. Price came out $0.95 and I changed to $1.00 without changing margin number.

In this case If I put new number on price, my formula is gone.

I need formula that works both way. If I change either margin% or price they work together.

I really need your help~

Thank you in advance.

Steve