Write a Python program as described below.

Modify the tkinter Calculator example to include the following.

Add the following keys and functions.

$+-$ Key: This key will invert the sign of the result or of the last number entered in an expression.

$$ Key: This key will take the square root of the result or of the last number entered in an expression.

$\frac{1}{x}$ Key: This key will take the reciprocal of the result or of the last number entered in an expression.

CE Key: $($Clear Entry$)$ This key will delete the last number or function entered in an expression.

$\%$ Key: This key will divide the result or the last number entered in an expression by $100.$

Add the following menu items:

Exit: This should exit the program.

About: This should provide a pop$-$up message with your name and the date. For example:

Author: Bob Student

Date: December $2024$

Bonus $50$ points: Add a 'Mode' menu item. The allows the user to switch between standard entry mode and RPN mode. When in RPN mode the last four items on the stack should be shown in the display. Add a key for