Create a Windows Version of an Android App

I have an Android App called Gold Bug Calculator that has already been released. I am looking to create an identical version but one that can be launched as a Windows app rather than Android. The app calculates the value of different precious metal items. It has a datafeed of currency rates and precious metal prices. There are 4 basic tabs/functions. 1) Where you can get the price of an item 2) Where you can build a portfolio of your precious metal items, 3) where you can look up the precious metal content of an item 4) where you can find out how much of a metal a certain amount of cash will buy you. I will provide the code of the Android app. The coders job is to translate it into a Windows format Completion of this project will be determined by the app being up and running and accepted by the Windows market place and me having tested it in the that environment. The coder must be able to help me set up a testing environment on my PC. 20% of the project at least will be tweeking and changing the project as needs arise as the project develops. Please quote price and time to completion.