Taxa de Desconto

import math
from tkinter import *
root = Tk()
root.geometry("500x400")
root.resizable(0, 0)
root.config(bg="#0e465e")
root.title("Taxa de desconto (TD)")
titulo = Label(text="Taxa de Desconto",
               font=("Arial", "35", "bold"),bg="#0e465e",fg="#10b5ad")
titulo.place(relx=0.08, rely=0.05)
texto_sub1  = Label(text="Taxa de Juros Anual (em %):",
                    font=("Arial", "15", "bold"),bg="#0e465e",fg="#10b5ad")
texto_sub1.place(relx=0.05, rely=0.35)
texto_sub2  = Label(text="Tempo do Investimento (em anos):",
                    font=("Arial", "15", "bold"),bg="#0e465e",fg="#10b5ad")
texto_sub2.place(relx=0.05, rely=0.55)
Taxa_Juros = DoubleVar()
Taxa_Juros_entrada = Entry(textvariable=Taxa_Juros,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
Taxa_Juros_entrada.place(relx=0.65, rely=0.35, relwidth=0.25)

Tempo_Investimento = IntVar()
Tempo_Investimento_entrada = Entry(textvariable=Tempo_Investimento,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
Tempo_Investimento_entrada.place(relx=0.75, rely=0.55, relwidth=0.2)
def limpar():
    Tempo_Investimento_entrada.delete(0, END)
    Taxa_Juros_entrada.delete(0, END)
    resultado.set("")
def app():
    n = Tempo_Investimento.get()
    i = Taxa_Juros.get()
    ipp = i/100
    taxa_desconto = 1 / math.pow((1 + ipp), n)
    mensagem = f"Taxa de desconto é de {round(taxa_desconto,2)}"
    resultado.set(mensagem)



but1 = Button(text="Calcular", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'), command=app)
but1.place(relx=0.05, rely=0.65, relwidth=0.25, relheight=0.1)
but_limpar = Button(text="Limpar", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=limpar)
but_limpar.place(relx=0.35, rely=0.65, relwidth=0.25, relheight=0.1)

but_sair = Button(text="Sair", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=root.destroy)
but_sair.place(relx=0.65, rely=0.65, relwidth=0.25, relheight=0.1)


resultado = StringVar()
resultado_texto = Label(textvariable=resultado,
                           font=("Arial", 12, "bold"), bg="#cfe2f3")
resultado_texto.place(relx=0.05, rely=0.8, relwidth=0.9,relheight=0.15)

root.mainloop()
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Taxa de Desconto
