Custo da dívida

from tkinter import *
root =Tk()
root.geometry("500x450")
root.resizable(0, 0)
root.config(bg="#d9ead3")
root.title("Custo da dívida")
def app():
despesa = Despesa_Juros.get()
imposto = taxa_imposto.get()
impostop = imposto/100
dp = dívida_pendente.get()
#Cost of Debt = Interest Expense * (1 – Tax Rate) / Outstanding Debt
a = despesa*(1-impostop)
b = (a/dp)*100
resultado_final = round(b,3)
resultado.set(resultado_final)
def limpar():
taxa_imposto_entrada.delete(0, END)
Despesa_Juros_entrada.delete(0, END)
dívida_pendente_entrada.delete(0, END)
texto_sub1 = Label(text="Custo da dívida",
font=("Arial", "15", "bold")
,bg="#d9ead3",fg="#bf9000")
texto_sub1.place(relx=0.35, rely=0.05)
texto_sub2 = Label(text="Despesa com Juros :",
font=("Arial", "12", "bold")
,bg="#d9ead3",fg="#bf9000")
texto_sub2.place(relx=0.2, rely=0.25)

texto_sub3 = Label(text="Taxa Imposto : ",
font=("Arial", "12", "bold")
,bg="#d9ead3",fg="#bf9000")
texto_sub3.place(relx=0.35, rely=0.35)

texto_sub4 = Label(text="Dívida Pendente : ",
font=("Arial", "12", "bold")
,bg="#d9ead3",fg="#bf9000")
texto_sub4.place(relx=0.28, rely=0.45)

Despesa_Juros = DoubleVar()
Despesa_Juros_entrada = Entry(textvariable=Despesa_Juros,
font=("Arial", "12", "bold"),
bg="white", fg="blue", justify='center')
Despesa_Juros_entrada.place(relx=0.6, rely=0.25, relwidth=0.25)

taxa_imposto = DoubleVar()
taxa_imposto_entrada = Entry(textvariable=taxa_imposto,
font=("Arial", "12", "bold"),
bg="white", fg="blue", justify='center')
taxa_imposto_entrada.place(relx=0.6, rely=0.35, relwidth=0.25)

dívida_pendente = DoubleVar()
dívida_pendente_entrada = Entry(textvariable=dívida_pendente,
font=("Arial", "12", "bold"),
bg="white", fg="blue", justify='center')
dívida_pendente_entrada.place(relx=0.6, rely=0.45, relwidth=0.25)

but1 = Button(text="Calculadora", bd=2, bg='#107db2', fg='white',
font=('verdana', 10, 'bold'), command=app)
but1.place(relx=0.05, rely=0.6, relwidth=0.25, relheight=0.1)
but_limpar = Button(text="Limpar", bd=2, bg='#107db2', fg='white',
font=('verdana', 10, 'bold'), command=limpar)
but_limpar.place(relx=0.35, rely=0.6, relwidth=0.25, relheight=0.1)
but_sair = Button(text="Sair", bd=2, bg='#107db2', fg='white',
font=('verdana', 10, 'bold'), command=root.destroy)
but_sair.place(relx=0.65, rely=0.6, relwidth=0.25, relheight=0.1)

resultado = StringVar()
resultado_texto = Label(textvariable=resultado,
font=("Arial", 12, "bold"),bg="#d9ead3")
resultado_texto.place(relx=0.5, rely=0.8, relwidth=0.3,relheight=0.08)

texto_sub3= Label(text="Custo da dívida (em %):",
font=("Arial", "13", "bold"),bg="#d9ead3",fg="#bf9000")
texto_sub3.place(relx=0.15, rely=0.8)
root.mainloop()

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