Calculate GST amount etc

Can someone tell me how to have the amount (in $ currency) in one cell divided by 11 and the quotient entered into another cell on the same row; then the quotient amount subtracted from the original amount and the result entered into a third cell in the same row. Would it be possible to do the calculation in one go? The results to two decimal places ie $120.56 Thankyou, dianaL

To leelnich, thankyou very much for your most elegant algebraic solution to my question - it works either way as well. Cheers, dianaL