I need help in finding out a formula that will help me in calculating the final prices of things and to give me a constant profit of 30.00.

Final price =X (unknown)
Transaction fees of final price .35 +13%
Shipping/handling + processing costs =31.06 I am charged this by company that send me the items.
Profits to be = to 30.00
Item costs for me = variable such as 34.00 or 83.00 which is a number than can be changed as costs change.