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I need help creating a cash-register WPF app with a GUI modeled like the figure below. I only need help with the code for the Enter and Total buttons...... The program should allow the user to enter a series of prices using the number buttons which should display into the READ ONLY textbox at the top. When they finish punching in a number and it is displayed at the top textbox, the user will select the Enter button. Then, the textbox should be blank so they can add more numbers until the Total button is clicked. (Not sure how to 'store' all the numbers they enter in until the Total button is pressed). When the Total button is clicked then all of the information in the bottom half should display results from all of the numbera that the user entered. The total includes tax at a rate of 5%. The DELETE button should clear the current entry, and the CLEAR button should reset the app.

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Cash Register 1-213 Enter Delete Clear Subtotal: S Tax Total