Create a Python program that uses a graphical user interface that will be used to order a pizza. Allow the user to enter the size (small, medium, large) and the toppings they want on it. When the click on the order button, Display the total cost of the pizza. Small pizza is 7.95, Medium is 9.95, Large is 13.99 Each topping is an extra .75.

TL;DR: I need help adding values to display the total. Also I did a list with multiple objects sharing same variable/value but all are selected and I have trouble adding values from sizes and each selected topping. Thank you in advance.

from tkinter import *

root = Tk()

root.title("Order Pizza")

v = IntVar()

menubar = Menu(root)

label_1 = Label(root, text="Name")

label_2 = Label(root, text="Address")

entry_1 = Entry(root)

entry_2 = Entry(root)

label_1.pack(anchor=N, side=LEFT, fill=X, expand=YES)

entry_1.pack(side=TOP, anchor=W, fill=X, expand=YES)

label_2.pack(side=LEFT,anchor=N, fill=X, expand=YES)

entry_2.pack(side=TOP, anchor=W, fill=X, expand=YES)

c = Checkbutton(root, text = "Save my order for future use")

c.pack(side=BOTTOM)

sz = Label(root, text="Select the pizza size", bg="turquoise", fg="purple")

sz.pack(side=TOP, anchor=W, expand=YES)

small = Radiobutton(root, text="Small ($7.95)", variable=v, value=7.95).pack(anchor=W)

medium = Radiobutton(root, text="Medium ($9.95)", variable=v, value=9.95).pack(anchor=W)

large = Radiobutton(root, text="Large ($13.99)", variable=v, value=13.99).pack(anchor=W)

tp = Label(root, text="Select toppings. ($0.75 each)", bg="turquoise", fg="purple")

tp.pack(anchor=W)

Toppings = ["Pepperoni", "Extra Cheese", "Olives", "Tomatoes" "Grilled chicken","Bacon"]

s = StringVar()

s.set("Toppings")

for text in Toppings:

b = Radiobutton(root, text=text, variable=0.75)

b.pack(anchor=W)

tip = Label(root, text="Tip amount").pack()

entry_3 = Entry(root).pack()

root.mainloop()